It’s absurd to put Darwin in the same list with Marx and Alinsky. The only “thought pattern” they share is aethism — something they share with millions of others.
Communists prefered Lamarckism to Darwinism — Stalin made the Lysenkoism (based on Lamarckism) the official dogma of the USSR.
Atheism is the essential ingredient and precursor to Utopian schemes like Communism and various other socialist ventures.If there is no God then Man must deliberately build the perfect society here on Earth.