God created man and then woman with his infinite power and wisdom but accidentally made them idiots who fucking love talking snakes and then left two trees with tasty looking fruit in their little play pen with which they could become gods themselves and a really big mouthed retarded snake. Opps.
But it's okay, after all, he knows everything and is infinitely smart, right? So basically he fucked around for a few thousand years carefully placing dinosaur bones and odd fossils in order to try and trick people into not believing in him and then made a bush talk to some crazy bastard with stones and a chisel and told him to discipline everyone according to some very specific rules. So the guy did and everyone went around murdering and raping people in the name of god and he quite enjoyed that but then he decided it was boring or something.
This next part is the really clever bit. He realised that he'd fucked up with the humans, he'd created a bunch of flailing morons who hate each other. In order to remedy the situation this infinitely powerful guy decided to impregnate some random chick with himself so that he'd be born so that he can sacrifice himself to himself so that he can forgive the humans and their retardedness which he'd created.
This actually took a very long time and so just like with the flaming bush scenario he ended up proving his existence to a bunch of people in the form of miracles and stuff, but that's all okay because of the fossils he'd placed earlier. It was actually a very cunning plan because this meant that it didn't matter that he had proved his existence quite unfairly to a small proportion of people because there's a much larger amount of people who will find the fake fossils and be unanimous in deciding that the bible is false which will counter everything out.
That's why Atheists exist, they make up for the fact that god has proven his existence to other people.