I do think its true that cosmologists are slightly more likely to be theists than biologists. In earlier times biology was the thing that provided the most powerful apparent evidence for the existence of a Creator Darwin solved all that. I think, in a way, cosmology is waiting for its Darwin. However, I would add this, that biology is supremely complicated. Complexity is the really difficult thing that you might think you need a designer for Darwin solved that. The universe actually, is not very complicated.
-Dawkins