Christians, please explain the proof of God's existence?

I was raised as a christian- catholic child. I never hated anything more than church. I always felt out of place. I never questioned god though. But since I have matured and I think for myself now. God is not real. He is a worldwide fallacy that was imagined by some men who wrote pieces of fiction. The bible is a work of fiction itself. I don't understand how you can say a man lives in the clouds and yet it's laughable for young children to believe in Santa Clause...or people to believe in ghosts, greek mythology, legends? If you believe a man in the sky watches all of you at once and he listens to people talk in their heads, but you think myths are and legends are fake, what does that tell you? The problem is children are pretty much brainwashed these days. What is the one thing nearly all families do? GO TO CHURCH. What percentage of families are christians? A LOT. They take their kids from BIRTH and brainwash them with this crazy fallacy that you die and go to a "paradise or heaven." And if you are bad you go to a dark "hell." So answer me this, how can you accept such a longshot religion but deny things such as paranormal activity? Why do you trust a book that has no evidence that anything inside of it is nonfiction. God is brainwashed in your minds.