Maybe there is God after all. For such a long time the person was completely unaware of its own mind not knowing where it is and how it works. Even now when the scientists knowing the physiology of the brain, can not and most likely will never fully understand all the aspects of human mind. If we can not comprehend such relatively accessible for research thing as our own brain, how can we claim that what we do not perceive and understand does not exist?
It is quite impossible to prove that God exist, but how can you prove that he does not?