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This may sound strange but there's absolutely no proof that God doesn't exist.
The lack of proof in favour of God's existance is proof that God probably doesn't exist.
He doesn't have a defined niche in our universe that cannot be explained by some other agency, there are arguments over whether his best witnesses even existed, and the reliability of those witnesses is questionable.
To you Jesus is the son of God. To me, and a lot of the people of his time, he is a guy who went out into the desert without adequate provisions, claimed to have heard the voice of the devil tell him to eat rocks, and came back claiming to be the son of God.
Go back a bit and everyone was listening to a guy who listened to a burning bush of indeterminate species, possibly the original wacky weed. Real reliable.
Now, we don't accept the existance of things based on that sort of testimony. Particularly when that something wants money. And particularly when that something's best argument is that you can't disprove its existance - a shitty argument at the best of times seen as one could just as easily worship the flying spagetti monster.