Yeah, it was. But so what?

Anyway, what does this sentence even mean:

"the original topic was the book "The God Delusion" by biologist Richard Dawkins, who claims to pin down the mechanisms of religiosity as a result of evolution."

Uhhhh....what???? Say that again? Is he saying that religiosity a result of evolution? Or is it an attempt to describe the results of evolution? Is Dawkins aware that a number of major Eastern religions and philosophies regard evolution as being both physical and spiritual, the two being innately connected to one another, or does he only have a bone to pick with the Judeo-Christian-Muslim religions?