Scott Adams frequently talks about free will, and how he thinks it doesn't exist. This conversation invariably leads to God talk, so he addressed that directly from the side of an atheist, in a written dialog. His point was that such arguments are futile, due to the no free will thing. I, on the other hand, was impressed by the argument "you can't prove god doesn't exist." I think that's probably true.

You can't prove the bagel fairy isn't real either. Go ahead and try. All the same arguments as big G God proof work with any made up creature that occasional unusual events can be attributed to. When I worked at PPC I often wondered who ate the last bagel (the one I was coveting) when there were only 4 people working and none had dusty chins. I just chalked that one up to the bagel fairy and went on with life. Now, who among you can prove to me that it wasn't?