It's rather hilarious when people talk about how Stalin and Hitler (a theist, mind you) killed lots of people and therefore this is what you get with atheist regimes. Aside from the fact that Hitler was a Catholic theist who backslid into some kind of weird paganism if I recall and got Papal support via his first treaty, this argument completely ignores the technological aspect. Give 1940s technology to the participants of the 8+ waves of the Crusades, 30-Years War, any supposed Old Testament genocide (the history of them actually happening is not exactly supportive, but Biblical literalists exist) and numerous other religion inspired wars (usually over the most retarded reasons imaginable) and you'd get similar numbers.
Not that such excuses Stalin and co., but to show one point in history wherein it isn't only theistic regimes committing atrocities is making a point you're not trying to make.
Not that such excuses Stalin and co., but to show one point in history wherein it isn't only theistic regimes committing atrocities is making a point you're not trying to make.