You have never met anyone who actually lives as if right and wrong were invented.
Ask a man on the street whether morality is just a human invention — a set of preferences we agreed on, like driving on the right side of the road — and plenty will say yes. Then cut in front of him in line, or lie to him, or take what is his, and watch how fast the philosophy evaporates. In an instant he is not expressing a preference. He is making an accusation. That’s not fair. You have no right. He is appealing to a standard he expects you to already know — a standard he did not make up and cannot unmake.
That reflex is one of the loudest arguments for God that exists, and it runs through every human heart. It is worth slowing down to hear it clearly, because it does two things at once: it points to a Lawgiver, and then it turns and points at you.
Everyone acts like the line is real
Start with what no one can consistently deny. There are some things that are not merely disliked but genuinely, actually wrong — wrong even if everyone in the room approved of them, wrong even in cultures that celebrated them. Torturing a child for entertainment is not “against my personal taste.” It is evil. The Holocaust was not a regional difference of opinion. It was wrong, and it would have been wrong even if the Nazis had won and rewritten every textbook to praise it.
The moment you admit that — and everyone does, the second the wrong is done to them — you have admitted something enormous. You have admitted there is a real moral line that stands over every human being, every government, every majority vote. Not a line we drew. A line we keep discovering, and bruising ourselves against.
Woe to those who call evil good, and good evil; who substitute darkness for light and light for darkness; who substitute bitter for sweet and sweet for bitter! (Isaiah 5:20)
You cannot call evil “good” and good “evil” unless good and evil are real, fixed things — the way you cannot call a crooked line crooked without a straight edge somewhere to measure it against.
A law needs a lawgiver
So where did the straight edge come from? This is where the honest atheist runs out of road. If we are only rearranged stardust — matter in motion, the accidental output of a blind process that does not care whether you live or die — then there is no reason the universe should owe you fairness, and no ground on which “cruelty is wrong” could be anything more than “I don’t happen to like cruelty.” Atoms have no opinions. Chemistry issues no commands. You cannot squeeze an ought out of a merely physical is. Matter can tell you what is; it can never tell you what ought to be.
A real, binding, universal moral law requires a real, personal, universal Lawgiver — someone with the authority to obligate every human conscience. Not the strongest tribe. Not the current consensus. A Person above us all.
There is only one Lawgiver and Judge, the One who is able to save and to destroy; but who are you who judge your neighbor? (James 4:12)
And Scripture tells you the law is not merely written on tablets somewhere far off. It is written on you.
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)
That is why the man who has never read a page of the Bible still feels the sting of guilt and the flush of indignation. The Maker signed His name inside the conscience. This is exactly what you would expect if we were made by a moral God, in His image:
God created man in His own image, in the image of God He created him; male and female He created them. (Genesis 1:27)
The two objections, taken honestly
Two answers always come back, and both deserve a fair hearing.
The first: “Morality is just evolution — we cooperate because it helped our ancestors survive.” Grant the biology entirely; herd instincts may well be real. But that only explains why we might feel an urge, never why we are obligated to obey it. Evolution could just as easily have wired us to feel that betrayal or cruelty pays — and sometimes, for the strong, it does. If survival is the only standard, then the man who prospers by lying has done nothing wrong; he has merely won. Yet everyone in the room knows he has done something wrong. That knowledge is the very thing the survival story cannot account for.
The second: “You don’t need to believe in God to be good.” Correct — and no Christian should say otherwise. Plenty of atheists are kinder than plenty of churchgoers. But that was never the claim. The question is not whether an unbeliever can recognize the moral law and even keep much of it. Of course he can — it is written on his heart. The question is whether the moral law makes any sense in a universe with no God to ground it. You can enjoy the light of the sun while denying the sun exists. You are still borrowing its light.
The argument turns and points at you
Here is where this stops being a debate and becomes personal. The very law that proves there is a God is the law you have broken. The straight edge that convicts the murderer and the liar is the same edge laid against your own life — and it does not flatter you. If the standard is real enough to condemn evil out there, it is real enough to condemn the pride, the lust, the deceit, the cold indifference in here.
for all have sinned and fall short of the glory of God. (Romans 3:23)
The moral argument was never meant to win a debate and leave you unchanged. It is meant to walk you to a mirror. God has already told you what is good:
He has told you, O man, what is good; and what does the LORD require of you but to do justice, to love kindness, and to walk humbly with your God? (Micah 6:8)
And not one of us has done it. So the same argument that dismantles atheism also dismantles our self-righteousness — and drives us to the only place the guilt can go. The Lawgiver did not merely hand down a standard and step back to watch us fail it. He came down, kept the law we could not keep, and took the sentence we had earned. The law says you are guilty. The gospel says the Judge became the substitute. That is where the argument was always headed.
So the next time someone tells you right and wrong are just human inventions, do not argue too hard. Just watch how they live — and how quickly they cry “unfair” the moment they are wronged. The line is real. They know it. You know it. And the One who drew it is still calling every conscience home.
Teaching the Word. Watching the Times.
— SmithForChrist