Darwin was a devout Christian (pdq)

That's a half truth, at best. The young Darwin was, but he changed his mind when getting older:

I had gradually come by this time (i.e. 1836 to 1839) to see the Old Testament, from its manifestly false history of the world, with the Tower of Babel, the rain-bow as a sign, &c., &c., and from its attributing to God the feelings of a revengeful tyrant, was no more to be trusted than the sacred books of the Hindoos, or the beliefs of any barbarian....
....Thus disbelief crept over me at a very slow rate, but was at last complete. The rate was so slow that I felt no distress, and have never since doubted for a single second that my conclusion was correct. I can indeed hardly see how anyone ought to wish Christianity to be true (old age Darwin, in his autobiography)

Wolfgang