Both Marx and Engles were Darwinists, as was Lenin. Yes, Stalin favored Lysenko’s even more crackpot ideas, but they were actually in vogue at the time, as most much of the global scientific community was ditching Darwinism in favor of other theories of evolution because it simply didn’t add up. Darwin was of course later restored to his rightful place of Communist honor a decade or so after Stalin’s death. Bottom line: whether it was Marx, Engles, Lenin, or Stalin...they all sought to replace God with one materialist form of evolution or another...just as the Evos are doing now.
The majority of scientists in the USA are people of faith. Biologists have no interest in ‘replacing God’ any more than a description of stellar or planetary formation in regards to physical forces ‘replaces God’ as the creator of the Heavens and the Earth.