Azimov--are you from England? I lament the fact that so many in this so-called progressive United States of America are so backwards in so many ways, not the least of which is the anti-intellectual disease which has spread and taken firm root in this country. There are several outstanding books for skeptics, and others who are curious. One is, "The Impossibility of God." And fabulous websites including www.atheism.about.com. Here are a few interesting logical arguments I've encountered, mainly in the two sources named above:
1. If god is omnipotent, and can be all things at once, i.e. a chair or a rat or even nothing at all, then whatever one believes in holds true, including believing in nothing. All beliefs would be valid. If god is not capable of being all things at once, then one must accept that god is NOT omnipotent, but limited in some way.