Our Belief: It's in our genes
Among other biologists delving into the cognitive dimensions of religious experience, Dean Hamer had the social/scientific theorists of religion abuzz with this watershed work, The God Gene: How Faith is Hardwired into our Genes.
In short, Dr. Hamer posits that it is not at all far-fetched to look for the predisposition for such beliefs engraved in our genetic code. The implications are obvious. And Dr. Hamer is extremely cute.