There's along but fascinating article in today's New York Times that discusses some the evolutionary theories explaining belief in God. I realize some here will dismiss this simply because it is in the NYT, and others will dismiss it outright because they deny the rational, scientific view. Nevertheless, I think there are some here who will appreciate it. I've added 5 more books referenced in the article to my growing reading list.
http://www.nytimes.com/2007/03/04/magazine/04evolution.t.html