Not very often but sometimes Christians grow up, educate themselves, and face facts.

Atheism is an acceptance of reality.

Theism (including the Christian and Muslim death cults) is a denial of reality.

Sometimes a Christian will learn how to think. It doesn't happen very often but it does happen. After they learn how to think they eventually realize their brainwashers were insane. They realize everything is a natural process and the magic god fairy was never necessary for anything. They become normal people, aka atheists.

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Somebody else wrote this: "Many believers admit that nothing could change their mind about their religious beliefs, which means they are no longer seekers of truth and have become, in essence, mindless religious robots. Religion consistently and effectively discourages introspection and inquiry. That isn't by accident."