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If There's No God, Why Does Everyone Know Some Things Are Wrong?

You don't need to be taught that torturing babies is evil. That's weird. That needs an explanation.

nocap.bible editorial

March 15, 20263 min read

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Here's something weird that nobody talks about enough: every human culture in recorded history — every single one — has had moral rules. Not the same rules exactly, but the same basic framework. Don't murder. Don't steal. Don't lie. Protect the vulnerable. Keep your .

Different cultures disagree on details. But the big stuff? Weirdly consistent.

C.S. Lewis noticed this and it wrecked his atheism.

The Argument

Lewis laid this out in Mere Christianity and it's still the most accessible version:

Every person has a sense that some things are objectively right and wrong — not just "I don't like this" but "this is actually wrong regardless of what anyone thinks"
This moral sense can't be fully explained by evolution, culture, or personal preference
A real moral requires a real moral Lawgiver
Therefore, the existence of objective morality points to God

Let's unpack each step because the objections are obvious and worth addressing.

"Morality Is Just Evolution"

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The Law Written on Hearts

Paul said even people who never read the Bible have the law 'written on their hearts' — their conscience bears witness. He's describing exactly the moral intuition philosophers can't explain away.

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This is the most common pushback. The argument goes: we evolved to cooperate because cooperation helps survival. Altruism is just a gene-preservation strategy. Morality is biology pretending to be philosophy.

Here's the problem: evolution can explain why we HAVE moral feelings, but it can't explain why they're TRUE. Evolution explains what helps us survive, not what's actually right.

If morality is just an evolutionary trick, then saying "genocide is wrong" has the same truth-value as saying "I don't like the taste of cilantro." It's just your brain chemicals talking.

But nobody actually believes that. When someone says "the Holocaust was ," they don't mean "my neurons in a way that produces a negative sensation when I think about it." They mean it was ACTUALLY, OBJECTIVELY wrong — wrong for everyone, everywhere, always. Wrong even if every human on earth decided it was fine.

Evolution can explain moral feelings. It cannot explain moral facts. And we all live as though moral facts are real.

"Morality Is Just Cultural"

If morality is just culture, then you can't criticize another culture's practices. You can't say was wrong in the 1800s South — you can only say it's wrong in YOUR culture. You can't say ISIS is evil — you can only say your culture disagrees with theirs.

Nobody actually holds this position consistently. Everyone smuggles in objective moral standards when it suits them.

Lewis pointed out the inconsistency beautifully: the moment you say one culture's morality is BETTER than another's, you're appealing to a standard above both cultures. Where does that standard come from?

"I Don't Need God to Be Good"

This isn't actually what the argument claims. The moral argument doesn't say atheists can't be moral. Obviously they can. Many are deeply moral people.

The question isn't "can you be good without believing in God?" The question is "can good EXIST without God?"

An atheist can recognize and follow moral truths the same way someone can enjoy music without knowing music theory. But the music still has a composer. The question is about the source of morality, not who's allowed to access it.

What Paul Said

made essentially the same argument in : "When , who do not have , do by nature things required by the law... they show that the requirements of the law are written on their hearts."

claim: even people with zero exposure to have moral knowledge built into them. Their "conscience bears witness." This isn't learned behavior — it's baked-in knowledge that points to the God who put it there.

The Bottom Line

Here's the thing that keeps tripping up the "morality is just chemicals" crowd: they can't live that way. Nobody treats morality as merely subjective in practice. When someone cuts you off in traffic, you don't think "their neurons produced a behavior that conflicts with my preferred neural patterns." You think "that was WRONG."

Every moral you make assumes a real standard exists. A real standard requires a real source. The Bible calls that source God, and says he wrote it on your heart.

You already know this. The question is whether you'll follow the evidence where it leads.

James

One Lawgiver

James said 'there is only one Lawgiver and Judge.' If moral law is real, it needs a source. James says there's only one candidate.

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If There's No God, Why Does Everyone Know Some Things Are Wrong?

The Argument

"Morality Is Just Evolution"

Related Chapters

The Law Written on Hearts

No Excuses

Related Questions

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More from Big Questions

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What C.S. Lewis Meant by 'The Weight of Glory'

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What C.S. Lewis Meant by 'The Weight of Glory'

C.S. Lewis on Why God Allows Suffering

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"Morality Is Just Cultural"

"I Don't Need God to Be Good"

What Paul Said

The Bottom Line

One Lawgiver