Just after the 14:55 mark in this interview with Charlie Rose, James Watson explains the religious mandate for evolution: No designer would have created this world (primate DNA sequences, in this case):
And I - I think when you—now that we`ve carried it forth, where we actually can look at DNA and see what it`s like in a chimpanzee, and you see all these things, the thought of anyone interfering, oh, boy. It just—it seems whacko.
The enormous scientific problems with evolution are inconsequential. Watson couldn’t even begin to tell us how the chimpanzee evolved. But he’s certain it must have. And Rose laps it up as usual. Religion drives science, and it matters.