Not sure what you mean by "can't prove". Every religious text on Earth was written by people and interpreted by other people. Every religion is run by people and followed by people. Faith is not the same as religion. God is not the same as religion. God does or does not exist independent of any faith that worships Him. Think about it, people were on Earth for countless centuries before the God of the Bible was ever worshipped. If said God exists, He went most of human history without anyone worshipping Him. That's why Zeus is pissed right now. He exists, but few believe it. The religion that worshipped him fell out of favor.

If God exists you can bet he's not a Muslim, Jew or Christian.

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I wasn't born with enough middle fingers.