[Devout Christians cannot be Darwinists, and vice versa.]
I know many devout Christians (who have an absolute faith in and a relationship with the God of the Bible) who are also Darwinists.
I can only assume you mean that only a person who is a devout Christian according to your own personal interpretation cannot be a Darwinist.
Simon Conway Morris is both. See for example about 1/4 the way down
excerpt
In an essay entitled, “Agreeing Only to Disagree on God’s Place in Science,” George Johnson reports from a Templeton Foundation seminar on science and religion in Cambridge. There, Dawkins, a featured speaker, had a heated exchange with Simon Conway Morris, a Christian paleontologist.
Seems the two scientists started off pleasantly enough. They agreed, Johnson writes, that the “richness of the biosphere, humanity included, could be explained through natural selection.” They also agreed that “evolution is not a crapshoot”—that if the earth’s history could be redone the result might differ slightly, but “certain physical constraints would favor the eventual appearance of warm-blooded creatures something like us, with eyes, ears, noses and brains.”
But that’s where they “forked in orthogonal directions.” For Conway Morris, nature’s ability to produce moral creatures, humans, indicates that God must have orchestrated evolution. Dawkins doesn’t buy it, and he asked Conway Morris why, if they could agree on everything else, he has to add God to the picture. From a scientific perspective, Dawkins said, Conway Morris’s God was “gratuitous.”
Ouch. Dawkins’ remark apparently left Conway Morris “momentarily flummoxed,” as he “muttered to himself.” Dawkins, Johnson writes, “had scored a crucial point.”
End excerpt
Conway Morris is one of the world's experts on the Burgess Shale.