Simple really - there isn't a god. There is not one iota of proof. Nothing. Nada.
The very concept of there being a god is as absurd in the belief of leprachauns. Actually, its probably more absurd than believing in leprachauns as the belief in leprachauns has never, to my knowledge, resulted in wars, torture and murder that the belief in god has, and still does to this day.
I really struggle to understand how seemingly intelligent people can believe in something as absurd as a god when, surely, it is patently obvious to anybody with even a moderate grip on reality that the very premise is mind bogglingly stupid.