[quote=So Boerd]
Seeing as I made a factual claim, simply stating that the murderers were atheist, I don't see why knowing why they did it in any way refutes that they were atheist.
[/quote]

Because Hitler was most certainly not an atheist and nobody can confirm what Stalin or Mao felt about religion beyond getting rid of it to impose their own fanatical cults of personality.

Another "atheist" regime is North Korea, where they deposed gods in exchange for making their leader a god who can kill you if you merely think badly of him. That's hardly atheist, wouldn't you say?