His father was the first Anglican clergyman to support Darwin. He published a theory of evolution before Darwin. His influence on his son was obviously corrupting.
But let there be a whisper from some worthless creationist propaganda factory about Stalin, and -- ta da! -- suddenly that's all a creationist needs to wildly leap to his favorite conclusion. Oh, it's rather well established that Stalin was educated in a Russian Orthodox seminary. But I guess that doesn't count.