Well, I mean I do find it hilarious when Atheists talk about mass Christian atrocities, yet leave out the Soviet Union (a mass atheist atrocity).
Yet, I consider myself an Atheist. Evangelical Christianity tends to be pretty pathetic as a whole IMO. To stuck in 2000 era Texas values Conservatism.
The charitable and intellectually honest thing to do is attribute atrocities done by 'insert group/view here' only to those views that were the PREPONDERANT INSPIRATION for the objectionable action.
Yes, the soviet union was officially atheist. But the preponderant inspiration for stalins' purges of the general core was the personalized paranoia of one Josef Drugashvilli (not atheism). The preponderant inspiration for the collectivization of farms was a crackpot economic ideology (not atheism).
It is a sign of a charitable and evolved religious 'opponant' that they are able to separate actions done BY 'Christian/muslim/atheist' from those actions that are INSPIRED 'by same'.
MY personal reading of history is that to attribute the horrors of communism to atheists is as silly as attributing the horrors of the concentration camps to men with funny mustaches.