Mailbag – Page 2 – Michelle Lesley

Originally published December 4, 2017

Merry Christmas! Starting today, we’re back to Monday through Friday blog articles for the holidays!

As Christian parents, is it OK for us to tell our children about Santa Claus?

As Christian parents, is it OK for us to tell our children about Santa Claus?
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Christmastime can be so much fun when you have children. Many of us remember the excitement of Santa, the Christmas tree, and presents from our own childhood. They’re happy memories, and we want to recreate those for our children.

But as Christian parents, our first priority isn’t fun, it’s obedience to Scripture. Yet, is there a way to make Christmas merry for our children while still upholding God’s Word? Is Santa patently unbiblical?

No, he doesn’t have to be, as long as he keeps his sleigh parked inside the parameters of Scripture. Let’s take a look at some of the ways Santa can be unscripturally naughty, and how godly parents can keep him nice and biblical.

Santa Claus isn’t real. If you tell your children he is, or that he is the one who brings their presents, or that he knows whether they’ve been naughty or nice, you’re lying. The Bible says that lying is a sin, period. There’s no exception for jolly old elves who pass out toys (or for tooth fairies or Easter bunnies, either, for that matter). And not only is lying a sin, it is extraordinarily hypocritical to lie to your children about Santa Claus and then turn around later and punish them when they lie about something. Lying to your children about Santa Claus teaches them that it’s OK to lie (i.e. sin) when you want to or when it would be to your advantage.

The Bible says that lying is a sin, period. There’s no exception for jolly old elves who pass out toys (or for tooth fairies or Easter bunnies, either, for that matter).
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Don’t lie to your children about Santa Claus. Tell them the truth: he’s a fun, fictional character that we can enjoy reading stories and singing songs about, just like Goldilocks or Superman or Old MacDonald. As for the presents, maybe you’d like to handle it similarly to the way my husband and I did with our children. When they were very small, my husband or I would don a Santa hat on Christmas Eve and say something like: “You know how you like to play pretend? Well, mommies and daddies like to play pretend, too, especially at Christmas! Now it’s time for you to go to bed so we can pretend to be Santa Claus.”

Santa Claus isn’t omniscient.

He sees you when you’re sleeping
He knows when you’re awake
He knows if you’ve been bad or good
So be good, for goodness’ sake!¹

Uh uh. No way. Omniscience is an incommunicable attribute of God. He is the only One who has the power to see and know all things, and it is an insult and an affront to Him to even suggest that a mere mortal – let alone a fictional character – has the same power and knowledge that He has. In reverence and awe for God’s preeminence, we should never ascribe to others the things that belong to God alone.

Teach your children about the attributes of God. When you read your children stories about Santa Claus or hear Santa Claus Is Comin’ to Town on the radio, it’s a perfect opportunity to teach them about God’s omniscience and power. “Did y’all just hear that? That song said Santa Claus can see you and knows how you’re behaving. Is that true? Who is the only One who always sees you, cares for you, and knows what you’re doing and thinking? Can anybody else besides God do that?”

Santa Claus teaches works righteousness. In St. Nick’s economy, good behavior earns a reward (presents). Bad behavior earns punishment (coal). If you’ve ever shared the gospel with anybody, that will probably sound familiar. Most lost people think that’s what Christianity is. If you’re a “good person” God is happy with you and you’ll go to Heaven. Hell is the punishment for “bad people”: Hitler, murderers, and rapists. This is not what the Bible teaches, either about salvation, or about why children should obey their parents.

Teach your children the gospel. Again, this whole “naughty or nice” part of the Santa Claus narrative is a perfect gospel-teaching opportunity. Take advantage of it! Ask your child to be “nice” for one whole day. At bed time, take a few minutes to talk about the times she messed up and was “naughty” when she was supposed to be trying to be “nice.” Nobody can be nice and obedient all the time, no matter how hard we try. We are all naughty – sinners with coal black hearts deserving the punishment of Hell. Jesus came and lived a life of perfect “niceness” (obedience), died on the cross to take the punishment for our naughtiness, was buried, and rose again. He did that, not because we earned it with good behavior, but because of His mercy and grace. And then He gave us the greatest gift ever. A gift we naughty people don’t deserve: salvation and eternal life in Heaven. And it is because of our love and gratitude to Christ for saving us that we obey Him, not so that He will give us what we want. Indeed, the Bible tells us that the more obedient to Christ we are, the more persecution we will face.

Santa Claus doesn’t automatically have to be on the Christian parent’s naughty list. There are lots of ways to enjoy the fun of Santa and even turn him into an opportunity to teach your child biblical truth, all while being obedient to Scripture. But if Santa makes you biblically uncomfortable in some way, then by all means, don’t go against your conscience. Whichever way you decide – after prayer, study of the Scriptures, and discussing it with your spouse – do not judge other Christian parents by your personal convictions about Santa Claus.

Any advice for grandparents about Santa? Our son wants our grandchildren to believe in Santa. How do we respond to a grandchild who asks of the reality of Santa? I will not lie, but I want to keep peace with my son.

Thank you for being a godly grandma!

I think the solution to this dilemma is going to start with being a godly mom. Is your son a Believer? If so, you might want to show him all of the information above and talk to him about any Scriptures he’s violating. Let’s pray that will be convicting to him and he’ll decide to handle Santa in a godly way with your grandchildren.

But if he’s not convinced, or if he’s not a Believer, talk to him about your convictions about not lying to his children. Explain the difficult position he’s putting you in. He’s essentially asking you to choose between pleasing him by sinning (lying) or pleasing God by not sinning.

If he still won’t relent, the only solution I can see that keeps you from sinning yet doesn’t go against your son’s wishes is to put it back on him. When your grandchild comes to you and asks, “Grandma, is Santa Claus real?” you reply, “That’s a great question, but I think you should ask your mom and dad about that. How about some hot chocolate?”.

Your son made this bed. You shouldn’t have to lie in it.

Additional Resources:

Santa Pause with Justin Peters at A Word Fitly Spoken

¹Santa Claus Is Comin’ to Town. John Frederick Coots and Haven Gillespie, 1934.

If you have a question about: a Bible passage, an aspect of theology, a current issue in Christianity, or how to biblically handle a family, life, or church situation, comment below (I’ll hold all questions in queue {unpublished} for a future edition of The Mailbag) or send me an e-mail or private message. If your question is chosen for publication, your anonymity will be protected.

Mailbag, Thanks/Thanksgiving

The Mailbag: Teaching Children Gratefulness

November 18, 2025November 13, 2025 Michelle Lesley

Originally published November 22, 2021

Do you know of any Biblically sound books that will help teach a 3 yr old how to have a grateful heart? My daughter is trying to cultivate that in my 3 yr old grandson.

Awww, how sweet! What a blessing that he has a godly mommy and Grammy (or Mimi or Mamaw or…).

My youngest child is 18 so I’m not familiar with whatever is currently popular and available, although I’m sure there are some good, doctrinally sound children’s books out there. (Readers, if you have any suggestions, let this sister know in the comments.)

But if you’ll indulge me a trip down memory lane to wallow in sentimentality for just a moment, this was my daughter’s favorite book when she was a toddler (and all her little brothers loved it too!). It combines counting skills, thankfulness, and a hymn – pretty great, if you ask me!

Count Your Blessings by Donna D. Cooner, 1995

Now, it’s just sitting in my closet waiting for my grandchildren to enjoy it…❤

If you decide to buy some toddler books on gratitude, I would just caution you to vet the authors of any book you’re considering just like you would vet the author of a book for adults. There are many false teachers – Priscilla Shirer, Sarah Young, and Sheila Walsh just to name a few off the top of my head – who have branched out into writing children’s books.

But honestly, I think this is a great opportunity for you and your daughter to start teaching your grandson the Bible, Scripture memory, and prayer as it relates to being grateful to God.

This is a great opportunity to start teaching your child the Bible, Scripture memory, and prayer as it relates to being grateful to God.
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Read some stories about people in the Bible who were thankful – the thankful leper, Zacchaeus, Noah, Daniel, rebuilding the temple…really any story in which God acts, provides, or protects and people thank Him for it – and ask a few simple questions.

What did the main character in the story need or ask God for? What did God do?
What did the main character say or do when God acted, provided, or protected?
Has God ever acted, provided for, or protected you like that? How can we tell Him thank you?

Grab your concordance and look up some words and phrases like “give thanks“. Find a simple verse(s), talk about what it means, and practice saying it together. You might be surprised at just how quickly he can memorize those verses! The Bible verse memes in my article Top 10 Bible Verses on Giving Thanks are perfect for printing out or copying to your phone or tablet for this.

Another way to reinforce giving thanks to God is through music. You may find something helpful at Seeds Kids Worship, or just create your own playlist on your favorite music platform.

One way I helped my children remember to be thankful (and let me tell you, it didn’t just help my children!) was with a simple little game I called The Gratitude Game. It’s kind of like playing “I Spy.” Just look out the window when you’re driving around in the car, or look around as you’re taking a walk, and take turns thanking God for what you see: “Thank You, God, for making birds.” “Thank You for ice cream.” “Thank You for police officers who help us.”

Be sure to model thankfulness, too. When you or your daughter say bedtime prayers or the blessing before meals with your grandson, be sure to spend some time thanking God for things and acknowledging Him as provider, protector, the Giver of blessings, and so on. Remark thankfully on various things throughout the day: “I’m so thankful God gave us a warm day to play outside,” “Thank you, God, for sending the ice cream truck our way!” Also make sure you’re showing gratitude to people. Set the example for your grandson of saying “Thank you,” sending thank you notes or gifts, and demonstrating appreciation for others.

Books can be fun and helpful, and I hope you find a good one for your little sweetie, but you can’t beat stories and activities that center on Scripture itself.

When it comes to teaching your little ones gratitude, you can’t beat stories and activities that center on Scripture itself.
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Mailbag, Worship

The Mailbag: Potpourri (Boundaries… Submit vs. address sin?… Discernment- Who do you think you are?)

November 4, 2025November 3, 2025 Michelle Lesley

Welcome to another “potpourri” edition of The Mailbag, where I give short(er) answers to several questions rather than a long answer to one question.

I like to take the opportunity in these potpourri editions to let new readers know about my comments/e-mail/messages policy. I’m not able to respond individually to most e-mails and messages, so here are some helpful hints for getting your questions answered more quickly. Remember, the search bar (at the very bottom of each page) can be a helpful tool!

Or maybe I answered your question already? Check out my article The Mailbag: Top 10 FAQs to see if your question has been answered and to get some helpful resources.

This comment was left on my article, Taking Offense:

Thank you for this biblical truth: “Jesus taught us to…love our enemies, do good to those who hate us, bless those who curse us, pray for people who abuse us, turn the other cheek, give to those who want to take from us, treat others the way we want to be treated”. Are boundaries biblical then? Do we stick around when someone is pouring out non-stop criticism and verbally abusing us or talking behind our back? Family members can be the worst. People who are not following Jesus and who are consumed with darkness, hate people who are walking in the Light. I understand not taking offense, but in my experience, when I turn the other cheek to abusers, they keep abusing and hate you more. It is not good to allow them to sin against us because when their sin flows freely, it not only harms me but it harms them too. Thoughts?

Great question! It’s one Amy Spreeman and I have received numerous times over the past few years, so we’ve recorded a podcast mini-series on it!

Beautiful Biblical Boundaries- part 1 deals with the Scriptures and biblical precepts addressing boundaries. We discuss how and when to erect boundaries (and how and when not to). This episode is currently scheduled to drop next Wednesday, November 12.

In Beautiful Biblical Boundaries- part 2, we’ll answer listeners’ questions about boundaries in their own lives and relationships. This episode is currently scheduled to drop in about two weeks, on Wednesday, November 19.

Please note that the links above will not work until the dates specified.

This comment was left on my article, Marriage: It’s My Pity Party and I’ll Cry if I Want To ~ 7 Ways to Take Your Focus Off Yourself and Put it Back on Christ (By the way, yes, I realize that the length of the titles of some of my articles rivals those of many of the Puritans’ books and pamphlets. I’m OK with that.😀)

I have a question about number 7…

This article pertains to normal, relatively healthy, Christian marriages. In other words, not abusive marriages. If you are being abused, get yourself and your children to a safe place, and call the police, your pastor, or a loved one for help.

Of course, I agree that we should be subject to our husbands. However, are we not to call them out gently on their sin when they are acting like “an ungodly jerk” according to various verses such as Proverbs 27:5, Luke 17:3, Matthew 18:15, and Galatians 6:1? I guess I’m just confused because both commands seem to contradict each other.

This is another super question! The short answer is, “Yes,” but as Ecclesiastes 3:1,7 tells us, “there is a time for every matter under heaven…a time to be silent and a time to speak,” and in the moment when your husband is acting like “an ungodly jerk,” he’s apt to respond poorly to his sin being exposed and corrected, which just compounds his sin. (And frankly, we wives usually respond just as poorly in that moment when the shoe is on the other foot.)

In that moment, generally speaking, it’s usually a time to be silent, and, assuming he’s not asking you to sin, do whatever it is he’s gruffly or impatiently asking you to do with a gracious, kind, willing, and loving attitude and demeanor, as opposed to pouting and feeling sorry for yourself – which is the theme of the article (and also why #7 focuses on the “a time to keep silent” aspect of submission rather than the “a time to speak” aspect of addressing your husband’s sin).

Have you ever heard the phrase “killing someone with kindness”? God has an amazing way of taking our example of godly obedience, kindness, and refusing to retaliate, and using that to convict the other person of his sin. He does that Himself with us:

Or do you think lightly of the riches of His kindness and forbearance and patience, not knowing that the kindness of God leads you to repentance?
Romans 2:4

So, yes, there’s a time to speak and – approaching your husband the way you would want to be approached – kindly and humbly address his sin. That time is usually… later. Not in the moment.

What makes you confident in your ability to determine who is a true or false teacher of the Bible? Are you a theologian or do you have background in studying theology and the Bible? Just curious.

(I’ve distilled this question down from a much longer laundry list of complaints from a follower about a Facebook post in which I warned against false teacher Priscilla Shirer. It’s hard to tell from the wording in the brief excerpt above, but this was not a genuine, good faith question from someone desiring to grow in her discernment skills. It was tossed out in a snarky, accusatory, “Who do you think you are?” tone. My tone below, per Proverbs 26:5, is a biblically appropriate response to hers.)

The Bible makes me confident in my ability to determine who is a true or false teacher of the Bible. And if you’re a genuinely regenerated Christian, it should make you confident too.

Our authority as Christians comes from God’s Word, not from a seminary. You don’t have to go to seminary to be a discerning Christian (in fact, many seminaries are so rife with false doctrine that you’d better be discerning before you get there). If you think about it, none of the people who wrote the Bible’s teachings on false teachers and false prophets ever went to seminary, including the Bereans, whom God praised for their discernment.

Scripture tells us:

Beloved, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world.
1 John 4:1

Examining teachers and comparing their teaching and behavior with Scripture is a command from God for Christians, not an option, and certainly not something for Christians to criticize and scorn other Christians for doing (as long as they’re doing it biblically, which I am).

So the question here is not why am I obeying God’s Word, testing this spirit against Scripture, and when she’s found to be a false teacher, warning other Christians about her. The question is, if you’re a Christian, why aren’t you? Why aren’t you studying your Bible so that you understand it, and can see how Shirer’s words and actions conflict with it? Why aren’t you warning others against her? I would be very concerned about that for my own spiritual life if I were you.

I hope this resource will answer any other objections to the Bible’s command for discernment that you may have.

I later added these remarks (slightly edited here) to the remainder of the commenters on that post:

I would encourage you younger ladies (especially those who have been commenting in the “Where do you get off?!?!” vein to me) to consider this:

“When one becomes so familiar with His Word you can spot a false teacher a mile away – I told my girls that when you walk close to God and His WORD you become sensitive to the clanging gong of false teachers.”

This quote is from a 70+ year old “Titus 2:3-5 woman” who has been walking with the Lord and a passionate student of God’s Word for over 50 years. And she’s right. And as a younger woman (I’m 56), I’m very thankful for the wisdom she just spoke into my life.

As I said, I’m 56. I have been a faithful member of decent churches since 9 months before I was born. I’ve been saved since I was 12. That means I’ve been walking with the Lord and studying His Word at church, a Christian high school and college, in other Christian organizations, and on my own for 44 years. Longer than many of you have been alive. Furthermore, I’ve been blogging and “doing discernment ministry” for over 17 years.

If you had a doctor with 44 years of training and 17 years of diagnostic experience and he gave you a diagnosis you didn’t like, would you immediately throw it back in his face with a sassy, disrespectful, “What qualifies YOU to say so?” or “What makes you so sure you’re right? MY opinion is…”. I doubt it. You might respectfully ask him some questions or request some resources to help you understand. You might even politely seek a second or third opinion, but you would not be so brash and arrogant to immediately assume he has no idea what he’s talking about and is just being mean to you, and you know better than he does.

I’m not saying this to toot my own horn or “look down on anyone’s youth” (that would be out of context, anyway), and I’m certainly not saying I’m without sin or never make mistakes. I’m saying there’s a reason Titus 2:3-5 specifies that older women are to train younger women. (Which implies that younger women should listen to older women instead of immediately dismissing us out of hand when we say something you don’t like – especially when it’s backed up with rightly handled Scripture and other mature, doctrinally sound Christians corroborate it.) Younger women do not have the same spiritual maturity, life experience, wisdom, and biblical training that older women have who have been walking with the Lord for decades. (I definitely didn’t have it when I was a younger woman!)

By all means, get a second opinion from rightly handled, in context Scripture. Politely ask questions. Do the research on your own. But stop being so reactionary and lashing out every time you hear something biblical that you don’t like. All you’re doing is showcasing your spiritual immaturity and ignorance of Scripture and your lack of self control. Or, worst case scenario, you’re bearing the fruit of someone who isn’t saved.

I’m far from perfect, but I didn’t just fall off the turnip truck and start slinging the label of “false teacher” around willy nilly. By God’s incredible grace, mercy, wisdom, and sanctification, I’ve been doing this a long time, and I know what I’m talking about – all glory to Him.

Holidays (Other), Mailbag

The Mailbag: Halloween vs. Yoga?

October 29, 2025October 25, 2025 Michelle Lesley

Originally published November 1, 2021

I read your article Should Christians Participate in Halloween? and I am hoping to get a point cleared up in my head. I don’t want to be legalistic, and hope not to come across that way. I am just very confused about it. I agree with you on every other theological point. But I don’t see this as [adiaphora] in the same way I don’t see practicing yoga as [adiaphora]. I asked you this same question last year and did not get a reply. Maybe I asked in an offensive way. Honestly want clarity on this issue. How is partaking in any way with a pagan practice any different than practicing yoga? Thanks in advance.

This is a really great question. I appreciate how you’re thinking this through and wanting to be biblically consistent. I want to be biblically consistent, too, so let’s dig into this:

I asked you this same question last year and did not get a reply. Maybe I asked in an offensive way.

Let me quickly address this point of policy first. Although I don’t respond to people who come after me in an angry, argumentative, attacking way, that isn’t the only reason I don’t respond to emails, messages, comments, etc. In fact, it’s not even the main reason, because that’s a very small percentage of the correspondence I receive. So it’s very unlikely that’s the reason I didn’t respond to your question. (I apologize, but I don’t remember receiving the question.)

The main reason I don’t respond to most of the correspondence I receive is that I simply don’t have time. If you’d like a longer explanation about that, click here.

How is partaking in any way with a pagan practice any different than practicing yoga?

It isn’t. “Partaking in a pagan practice” is the reason yoga is unbiblical.

But that’s not what my Halloween article said nor what it was about. I know you actually read the article, and I really appreciate that, but a lot of people either didn’t read the article and only responded (vehemently) to the title of it, or they skipped, missed, or didn’t understand these very clear statements in the opening paragraphs:

…Halloween activities available to you that do not violate scriptural principles or your conscience or cause you to become a stumbling block to someone weaker in the faith…

Please understand that when I say [should Christians participate in?] “Halloween-related activities,” I am including things like handing out candy and tracts to your neighborhood trick-or-treaters, participating in your church’s trunk or treat {assuming no sin is being committed and the gospel is being shared}, etc.

The article in no way suggests that it’s OK for Christians to take part in paganism or sin. It just doesn’t. In fact, the Scriptures I quote in the article as well as my commentary on them, and all of the additional resources at the end of the article explicitly say that Christians are not to take part in those kinds of things.

But sharing the gospel with the children who come to your door, the acquaintances you talk with in your yard, the neighbors your kids trick-or-treat from, or the families who drop by your church’s candy-fest because it’s safe and non-scary is not, in any conceivable way, sinful, demonic, unChristian, celebrating Satan, or any of the other epithets that come my way every year when I run that article. And it certainly isn’t participating in paganism. How could sharing the gospel in any circumstance be demonic or any of those other things? It’s blasphemous to say such a thing.

Dear sister who sent in the question, I know you didn’t mean it that way, but please indulge me a tangent for a moment: I think some of the others who commented on the article didn’t think things through enough to realize this is what they were inadvertently saying with their broad brush remarks – that sharing the gospel in the midst of evil is itself evil.

Do we not remember that Jesus was a guest in the homes of prostitutes, tax collectors, and sinners – as evil an environment to the “Christians” of His day as Halloween is to Christians today? Do we not remember it was the Pharisees who rebuked Him for doing so and for (supposedly) defiling Himself?

Jesus didn’t defile Himself by going into those homes because He wasn’t participating in, nor approving of, any sin which took place there. He met those people where they were, called them to repentance, and planted the seeds of the gospel. And that’s exactly what many Christians do on Halloween. (And they often receive from their fellow Christians the same Pharisaical judgment Jesus received.)

And this is the crux of the answer to your question, my sister. Participating in dark, evil, pagan, or debaucherous aspects of Halloween is just as wrong as participating in yoga. How is participating in non-sinful aspects of Halloween different from participating in yoga?

Think of it this way: A kid rings your doorbell on Halloween. You hand him a tract and some candy. That tract is the good news that the celebration of death, evil, and darkness all around him is wrong and that Jesus is the light of the world and the Lord of life. You’re leveraging the good news of the gospel against the evil, pagan, and sinful aspects of Halloween. When you do yoga, you’re taking part in paganism, cooperating with it, and tacitly approving of it – not fighting against it.

I don’t see [Halloween] as [adiaphora] in the same way I don’t see practicing yoga as [adiaphora].

That’s good, because while participating in non-sinful aspects of Halloween, such as the aforementioned, is an issue of adiaphora (Christian liberty), participating in the pagan (Hindu) worship ritual of yoga is not, so you shouldn’t see them the same way.

All of this, of course, is not to say that you can’t avoid Halloween altogether if it makes you uncomfortable. You don’t have to take part in your church’s fall fest or hand out tracts at your door. You can go out to dinner, go to a Reformation Day worship service, go to bed early, or whatever you like. But what you can’t do is bind the consciences of your brothers and sisters in Christ who want to do something on Halloween that isn’t sinful and might even be evangelistic. You cannot unbiblically judge them by your personal convictions. And you certainly can’t call them names or question their salvation as I’ve had the misfortune of seeing some professing Christians do. You have to follow your biblically-informed conscience on issues of Christian liberty. Your brothers and sisters have to follow their own consciences. You will answer to God for your decisions. They will answer to God for theirs.

Additional Resources:

Christian Liberty at A Word Fitly Spoken

Christian Liberty with Michelle Lesley at Echo Zoe Radio

Mailbag

The Mailbag: When is OMG a 3CV?

October 14, 2025October 13, 2025 Michelle Lesley

Originally published February 11, 2019

Is it wrong for people to exclaim “Oh my G-d” in various situations? I have heard it said casually as well as in response to a tragedy or cry for protection. I would assume that it could be taking the Lord’s name in vain in certain circumstances (e.g. Oh my G–, look at that cute kitten!) but not in others. How can I discern when it is used correctly in ambiguous situations?

That’s a great question since this phrase and its initials (OMG) are used so frequently in real life, on TV, on social media, in books… it’s everywhere! Bless you for wanting your speech to honor the Lord!

A couple of explanatory points before I give my answer:

I’m including the initials OMG because when people see or hear those initials, they understand it to mean “Oh my G–!”. I’ve heard a few Christians say that when they use the letters OMG, in their minds, the “G” stands for gosh or goodness. That’s great, but that’s not what the overwhelming majority of other people think when they see or hear those letters, and they can’t read your mind, so that’s not what it means to them.

The third Commandment (taking God’s name in vain) is not limited to this phrase and its initials. There are many ways to misuse God’s name: profanity or offhand phrases (ex: “Good L-rd!”) that include any of the Trinity’s names, taking a vow or oath in God’s name flippantly and/or not keeping it, misrepresenting God or His Word to others, etc. However, the reader is asking only about this particular phrase, so I will simply answer the question she asked.

The third Commandment is:

You shall not take the name of the Lord your God in vain, for the Lord will not hold him guiltless who takes his name in vain.
Exodus 20:7

Let’s start with a fast and dirty rule of thumb in case that’s what you need: in today’s society in general, “Oh my G–!” and OMG are virtually always used in a way that takes God’s name in vain.

There are only a couple of instances I can think of in which using this phrase is not taking God’s name in vain, and I rarely even hear them in church, let alone on the street, on TV, etc. (Readers, if you can think of others, please comment and let us know.)

There are several verses of Scripture in various books of the Bible that contain the phrase, “O my God”. (I found it interesting that Nehemiah was fond of that phrase, as were the psalmists. Those two books contain the most verses with that phrase.) Here are a couple of examples:

Remember for my good, O my God, all that I have done for this people.
Nehemiah 5:19

O my God, in you I trust; let me not be put to shame; let not my enemies exult over me.
Psalm 25:2

If you’ll examine all of these verses you might notice a few things about the way this phrase is used in Scripture that sets it apart from the way this phrase is normally used today.

First, this phrase is used to address God directly. The people saying or writing this phrase in Scripture are talking to God, not using God’s name as an exclamatory (like we would use the words Wow! or Cool!) without giving Him any thought at all.

Second, this phrase is used reverently and worshipfully. It is used to honor God and the fullness of His nature and character, not, as you mentioned, to exclaim over kittens or some other paltry earthly happening.

Third, this phrase is used in the context of prayer, much the same way we would reverently address God in prayer with phrases like “Dear Lord” or “Heavenly Father”.

(One more thing that might be of interest to my fellow grammar nerds: When you see the phrase in Scripture, it always starts with “O”. When you see it written in the common exclamatory usage, it always starts with “Oh”. That’s not an accident. It’s meant to set apart the two discrete usages. Read more here.)

So the first scenario I can think of in which saying “O my God” would not be taking God’s name in vain would be things like: if you are quoting one of these passages, singing a worship song that either quotes one of these passages or uses the phrase in the same way in which it’s used in these passages, or if your pastor uses this phrase in his sermon or prayer in the same way in which it is used in Scripture.

The second scenario is similar: If you feel comfortable using this phrase in your own private prayer time by using it in the same way in which it’s used in Scripture – speaking directly, reverently, and worshipfully to God in prayer – there’s nothing sinful or unbiblical about that.

I would discourage the use of this phrase in public prayer, though, because it could confuse the people who hear it, causing them to think you’re breaking the third Commandment even if you aren’t. Additionally, if they hear you using that phrase in prayer with no explanation they may think you’re using it in the common (OMG!) way and assume that since you’re using it in prayer it’s OK for them to use that phrase in any situation. Sadly, most people are probably not familiar with the proper, reverent way this beautiful phrase is used in Scripture.