atomic bomb ◄ read that a few times. Also, its a bit ironic that the soviet scientists who made the largest atomic bomb ever detonated were all atheists, working under atheist ideals, for an atheist state. I'm pretty sure all the scientist working on the atomic bomb on the US side were atheists too.
Also, I suggest you read up on the history of early Mexico, when the national (atheist) leader called for a purge of all religon from the young nation...needless to say, the atheist decree led to bloodshed. La Reforma is one dark page from atheism.
I think you're forgetting about all the times people were killed for not agreeing with other religions or not being religious at all. You see it even continues today as many people kill than in court all they say is " it was in the name of god" or " the almighty father told me it was god's will" and shit like that. Religion is too full of shit.