Hi, LinearAq.
I almost agree with your point, and almost made it myself. However, I do think there is a difference between the Christian/Islamic based ideologies and atheistic ones. Namely, there are plenty of atrocities that are committed by people saying, "I do this in the name of Christianity/Islam/whatever." Very few that I am aware have said, "I do this in the name of atheism."
Now, maybe the atheistic part can be blamed when Christians, Jews, Muslims, or Buddhists are singled out for persecution for their religious beliefs; however, these then become a small part of the overall number of victims of ideologies that officially endorse atheism, so it is still possible that the persecutions due to
atheism is smaller than those due to other religious bigotry.
That said, I agree even so called "religious" conflicts, just like so-called "tribal" conficts, can be traced to more mundane political factors. But plenty of followers have been inspired to atrocities directly by religious fervor; I am having trouble thinking of an example where
atheism itself is a direct inspiration to great atrocities.
"These monkeys are at once the ugliest and the most beautiful creatures on the planet./ And the monkeys don't want to be monkeys; they want to be something else./ But they're not."
--
Ernie Cline