You can borrow the fruit of a worldview you have already thrown away. But not forever.
“I do not need God to be a good person.” It is one of the most common things a believer hears, and on the surface it sounds unanswerable. Of course an atheist can be kind. Of course an unbeliever can be honest, generous, faithful to his wife, gentle with his kids. Anyone who has actually met people knows this. So the Christian who tries to argue that non-believers cannot behave well has picked the wrong hill and will rightly lose it.
But that was never the real question. The question is not can you behave well without God. The question is where does “well” come from in the first place. Not can you keep the rules — but who wrote them, and why should they bind anyone. That is a different question entirely, and it is the one the slogan quietly skips.
The difference between behaving and grounding
Picture two men who both refuse to steal. Ask each one why. The first says, “Because it is genuinely wrong to take what is not yours — wrong whether or not anyone is watching, wrong whether or not the law agrees, wrong in a way that would still be wrong even if the whole world decided otherwise.” The second says, “Because I was raised that way, and society functions better when people cooperate, and honestly it just makes me uncomfortable.”
Both men behave. But only the first is describing morality. The second is describing preference and conditioning wearing morality’s clothes. And here is the pressure point: on a purely material account of reality — no God, no design, just molecules and time — the second man is telling the truth about what morality actually is, and the first man is mistaken about the weight of his own convictions. If there is no Author above us, then “you ought not do that” can only ever mean “I would prefer you did not,” or “our tribe disapproves.” It cannot mean what we all feel it means when someone tortures a child: not I dislike this but this is evil.
The argument, laid out plainly
The moral argument for God is short enough to hold in one hand:
- If objective moral values and duties exist, then God exists.
- Objective moral values and duties do exist.
- Therefore, God exists.
Notice what the argument does not claim. It does not say atheists are immoral. It does not say you must believe in God to know right from wrong. It says something narrower and harder to escape: that the objective moral law everyone already lives by needs a foundation, and matter in motion cannot supply one. You cannot get an “ought” — a real, binding obligation — out of a universe that is only “is.” Blind physics does not owe anyone anything.
The second premise is the one most people actually believe, even when they say they do not. The proof is simple: watch what happens when they are wronged. The man who insists morality is just opinion will still cry “that is not fair” when he is cheated — and he will not mean “I personally disprefer this.” He will mean he has been genuinely wronged, that a real line was crossed. C. S. Lewis noticed this a lifetime ago: the very act of calling something unjust assumes a standard of justice you did not invent and cannot revoke.
What Scripture already said
The apologetic argument is only catching up to what Paul wrote two thousand years ago. He does not treat the conscience of the pagan as empty. He treats it as inscribed.
For when Gentiles who do not have the Law do instinctively the things of the Law, these, not having the Law, are a law to themselves, in that they show the work of the Law written in their hearts, their conscience bearing witness and their thoughts alternately accusing or else defending them.
Romans 2:14–15, NASB1995
That is why the honest atheist knows the difference between kindness and cruelty. Not because materialism explains it — it cannot — but because he is made in the image of a God he is trying not to acknowledge. The moral law “written in the heart” is not a human invention. It is a signature. And a signature implies a signer.
God created man in His own image, in the image of God He created him; male and female He created them.
Genesis 1:27, NASB1995
Here is the whole thing in one line: the unbeliever’s goodness is not evidence against God. It is evidence for the image of God stamped on a creature who is spending that image to deny the One who gave it. He is living on borrowed capital — enjoying moral dignity, human worth, and real obligation while sawing off the branch those things grow on.
How to answer without arrogance
So when someone tells you they do not need God to be good, do not argue that they are secretly wicked. Agree that they can be genuinely kind — and then ask the better question, gently: “I think you are right that you can be a good person. But let me ask you something I have had to ask myself. When you say something is really wrong — not just against the rules, but wrong — where do you think that comes from? What makes it more than your preference?” You are not trying to win. You are trying to walk a man back to the edge of the borrowed ground he is standing on, so he can see Whose it is.
The turn the argument cannot make on its own
And here the apologetic has to hand off to the gospel, because the moral argument, left by itself, is bad news. If there really is an objective moral law, then every one of us has broken it — not the atheist only, but the man making the argument. The same conscience that convicts the skeptic convicts the preacher. “There is none righteous, not even one” (Romans 3:10). A moral law with no mercy is just a mirror that shows you the dirt and hands you no water.
But God demonstrates His own love toward us, in that while we were yet sinners, Christ died for us.
Romans 5:8, NASB1995
That is the point the argument is quietly pointing toward the whole time. The God who wrote the law in your heart did not stay at a distance holding the standard over you. He kept the law you could not keep, and then took the penalty you had earned. So the answer to “can I be good without God” turns out to be a question with two floors. On the first floor: yes, you can behave — on capital you did not earn. On the second floor: no, not one of us has been good enough, and that is exactly why He came. The law was never meant to be your resume. It was meant to be your escort to the cross.
Teaching the Word. Watching the Times.
— SmithForChrist