"Yes, in fact, people -do- kill "in the name of atheism", provably, as a matter of simple historical fact, and do so by the millions."
I read your link. I see a lot of misbehaviour, but not a lot of killing - and certainly not enough to constitute "millions". For instance, "In Tsarist Russia, religion was a major source of violence and conflict between religious groups, and State Athiesm was designed to end these problems. Notable atrocities include the persecution and killing of over 200,000 Jews as "Christ-killers" due to pogroms."
So, confiscations, propaganda, suppression, sure... but please justify this claim of millions.