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How Do We Know that God Exists?

“What can be known about God is plain to them, because God has shown it to them.” — Romans 1:19

There is a kind of unbelief that sounds brave. It postures itself as honest, intellectual, reasonable. But beneath the surface, there is usually something much more familiar—and more ancient: a guilty conscience trying to find peace apart from repentance.

People don’t reject God because He’s hard to find. They reject Him because they love their sin and are burdened by the knowledge that their sin is real. As John 3:19 says, “light has come into the world, and people loved the darkness rather than the light because their works were evil.”

1. The Real Reason People Deny God

You can’t love sin and love the God who hates it. And so, when the weight of guilt grows heavy, most try not to lay it down—but to redefine reality. If God does not exist, then maybe guilt is an illusion, and I am free to do what I please. It's a fragile hope, but for some, it's enough to get through the night.

“There is no peace between God and the sinner until the sinner lays down the weapons of his warfare, ceases his rebellion, and returns to God through Christ.” — John Murray

But the conscience is not so easily silenced. It may be buried, but it is not dead. Like a smoke alarm you can't quite reach, it keeps beeping. The guilt remains. The knowledge remains.

“That there is a sense of Deity inscribed in the hearts of all, is beyond dispute… men of sound judgment will always be sure that a sense of divinity which can never be effaced is engraved upon men's minds.” — John Calvin, Institutes, I.3.1

2. The Proof Is Not Hidden—It’s Embedded

God has made Himself known through the very fabric of reality. From the unshakable structure of mathematics to the intricacies of biology, from the majesty of the stars to the ache in your soul when you see injustice—God has not left Himself without witness.

“There is not one square inch in the whole domain of our human existence over which Christ, who is Sovereign over all, does not cry, ‘Mine!’” — Abraham Kuyper

It’s not just that the world is impressive. It’s personal. It speaks. It says something. As C.S. Lewis put it, nature doesn’t just resemble a poem—it is written like one.

“Creation is the time-space theater of God’s glory.” — Herman Bavinck

Even the deepest skeptic cannot look at the world without assigning value to it, naming some things beautiful, others broken. But meaning is not the product of accident—it is the signature of an Author.

3. The Logic of God Is Woven into Everything

It is often claimed that reason and faith stand opposed. But this is backwards. Reason requires faith—faith in a God who made minds, meaning, and logic itself.

“If God is not, then nothing is intelligible. If God is not, then nothing can be predicated. If God is not, then nothing can be denied.” — Cornelius Van Til

Try to build a worldview without God and you will smuggle Him in through the back door. You’ll appeal to justice, truth, morality, beauty—each one borrowed from the Christian worldview.

“The natural man borrows or steals from the Christian world-view at every turn, but he is not even aware of it.” — Greg Bahnsen

This isn’t merely clever rhetoric. It is the unmasking of a profound irony: the very tools used to deny God only make sense because God is real.

4. And Still, We Resist

So why don’t people believe? Because the moment they do, everything changes. God is no longer a theory to debate—He is a King to whom we owe everything.

“Sin is not only a transgression of God’s law, but a denial of His authority—a dethroning of God.” — A.W. Pink

And yet, even as people run, they cannot escape the signs. They speak of purpose, of healing, of guilt, of longing. They make moral claims and cry out against injustice. They create and love and mourn. These are all echoes of Eden—resonances of the Image still etched in their bones.

“We are made in the image of God and cannot function properly apart from that reality.” — Francis Schaeffer

So they suppress the truth—not because it isn’t clear, but because it won’t leave them alone.

Final Word: Come Into the Light

Faith, then, is not a blind leap. It is the turning of the head toward what has always been there. It is not less than reason—it is reason restored to its proper place.

“Faith is the organ of knowledge, not of speculation—it is not blind, but seeing.” — J. Gresham Machen

God is not a guess. He is the grounding of all reality, the reason anything exists at all. But He is more than that. He is the One who speaks into our darkness and says, “Come.”

He is not merely the Judge we fear. He is the Father we need.

“Whoever does what is true comes to the light.” — John 3:21

You were made to know Him. You already do. The question is not whether God exists. The question is whether you will stop running.

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