I'd say that the probability of there being a God is 50/50. Just like someone who posted earlier said, God either exists doesn't. I personally believe God does exist and let me explain to you why.
Most people who don't believe in God believe in evolution and the big bang. The theory of evolution I agree with, even though I also believe in God. I also believe that the Big Bang took place, but it was created by God. How else could matter just appear out of nowhere. Something had to create it. things just dont make themselves. Television didn't appear one day, someone created it, just like with any other man made product on the earth. So how could the Big Band or anything of that sort happen if there was nothing there to begin with. And even if there was something there, what created that something. Just like what created elements. There has to be some supernatural force that created everything, or else nothing would be here in the first place.