Again, its more so the modern age that has to do with the numbers. When there are thousands of people on the Earth its hard to kill Millions of them. Add in guns and modern weapons and its no contest.
And given that atheism is really nothing (in the same way that a lack of beliefs in the tooth fairy is), there is no way to kill someone in the name of atheism. The bible and religious texts are littered with God commanding killing on the other hand.
And regardless if the leaders themselves are atheist, the people generally are and always have been, and they are generally those ones doing the killing.
In any event, I don’t find these types of arguments compelling. This is very much a “my dad can beat up your dad” type of situation, with no meaningful conclusion even if it could be known definitively whether atheists or religious people have killed more.
It’s not that I want God to “not let” people do bad things to each other, its a matter of his abilities and inclinations. I didnt say “God should do something”, I asked why he doesnt. We are talking about a God who is generally believed to be all powerful, all knowing, and all loving.
And this God is willing to punish people with eternal damnation if they don’t follow his rules, right? So obviously he doesn’t like people doing certain things and is willing to punish them for it. They are laid out explicity in his book apparently… Why wait until we are dead to render the punishment? Or better yet, why not just take the remove the idea from your creations heads in the first place?
If I walked in on a pedophile raping a child I would stop the act, not wait for the person to die to render punishment (Oh wait, he wont be punished because he can just accept Jesus and all is forgiven)
Of course none of this proves God doesnt exist, which is an unnecessary and impossible thing to do in the first place, but it should give one pause as to why they choose to willingly subject themselves to a life of servitude in His name.