You need to see South Park’s two part shows, “Go God Go” and “Go God Go II”. You want to see a world full of athiests, which are ripped on throughout the episodes, and don’t mind some of the coarse language, you’ll get a laugh.
They do a good job of skewering Richard Dawkins here too. I was laughing pretty hard. Even the athiests can’t get along ultimately, as there are several groups who have different answers to their own “Great Question.” You’ll be amazed at what that is.
As for the direct line argument, that is treating history as a causal science. History is more complicated than an easily explained series of causes. There have been many atheistic movements in history. One of the biggest and bloodiest was the French revolution, before Darwin, Nietzsche, and Nazism.
It seems to me that every age has people who want to be atheist. The Middle Ages had its scholars of Aristotle. Some of these were Christian, some only believed in an impersonal divinity, and some were materialist and atheist. Did Aristotle cause them to be that way? I would say no. They only found in their interpretation of Aristotle what they wanted to find.
I would not attribute this latest movie to a direct cause going back to Darwin, or anyone else. The author is simply an atheist, a tendency seen in every age. Let's simply hope this tendency does not become the majority opinion.