"Why should I believe that there is such a thing as a God?"

As far as I'm concerned there is no reason whatsoever why you should believe anything you don't want to, Fergie.

And I say that as a person who does have spiritual beliefs, by the way. One of them is that everyone has a perfect right to his or her own beliefs...while not, however, having a commensurate right to necessarily inflict them on others...

Is there one compelling reason for a god? Who knows? I hardly think I'm in a position to answer that question. (grin)