“evolution(ism)...leads to things like Nazism, Communism, and world wars.”
Hitler and Stalin were followers of unscientific astrology and Lamarkianism among other pseudo scientific beliefs. Aside from the world wars these twi were involved in, religions, both the Christian and others have promoted plenty of warfare on their own. Study European history and such topics as the Hundred Year’s War, and the Thirty Years War, not to mention the Crusades.
Between the end of the Napoleonic wars and 1913 an entire century had passed without a major or even significant European war. What ended that was the Darwinian idea of viewing your fellow man as a meat byproduct of random events.