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Keaton once said, “I don’t believe in God, but I’m afraid of him.” Well I believe in God, and the only thing that scares me is Keyser Soze.
— Verbal Kint · The Usual Suspects

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Keaton's fear of a God he doesn't believe in sets up a strange contrast. The speaker then claims belief in God but names only Keyser Soze as frightening. That comparison gives the named figure an extraordinary power to inspire fear.
Context reviewed