I've spent many, many hours on this God thing, and at the end of the day you can't prove nor disprove there is a God. Sure, you can assume all sorts of attributes about a God that don't make sense or are silly -- big old guy with beard in the sky. But the idea that there is some greater intelligence out there with some sort of interest in mankind? It's just impossible to know, one way or another.
Now some will tell you that because it is impossible to know, there must be a god. I.e, that we can put whatever thing we like under the category "god" -- one story is as good as another. Actually, this "creative story-telling for stuff we don't know" is a critical part of being a human, even being a scientist. As long as the stories don't contradict observable reality. So that's okay, up to a point.
Some will tell you that because we don't know, there must not be a God. If you can't prove it, it doesn't exist. Or put better: why add terms to an equation where no extra terms are needed? You see this in Hawking's essay -- once we figured out the theory, didn't need a God anymore.
The problem here is that this smacks of the caveman, when told about airplanes, said that the other person was either a fantastical liar or crazy. In his mind he is being uber-rational. From our point of view he's being childish and silly. Certainly things exist that we have not experienced. We do not know everything, and many things we think we know we are mistaken about. This is the way it has always been. It is part of being our species at this point in time.
So we're left not-knowing. And that bugs folks. I had a good friend that was an atheist tell me last week that sure, he didn't know, but he felt like he had to take sides. He felt like certain Christians he knew were somehow harming rationality, and it was up to him to sort of balance the scales. Many other people are profoundly disturbed by not-knowing and go the other way.
As for me? I've decided that while I cannot accept your story about an angry guy in the sky, the idea of not-knowing -- and the greater idea of our relationship to not-knowing, our relationship to the unknown, is a critical part of being alive. I choose to call that Great Unknown God, simply because, well, that's the traditional name for powers that are outside of our scope of knowledge. This allows me to enjoy both the work of the scientist and the priest.