This editorial called Good minus God by Louise M. Anthony is a good read. I’ll whet your whistle with her opening lines, and let you get on with the rest:
I was heartened to learn recently that atheists are no longer the most reviled group in the United States: according to the political scientists Robert Putnam and David Campbell, we’ve been overtaken by the Tea Party. But even as I was high-fiving my fellow apostates (“We’re number two! We’re number two!”), I was wondering anew: why do so many people dislike atheists?