Your list is not of specifically atheist regimes only (especially not on a thread in which the OP is attempting to deny the existence of atheism altogether on the grounds that people often harbor irrational superstitions and spiritual beliefs)Usually you put more thought into your responses.
and it does not present counts of people killed "simply due to their religious beliefs" at all.
Not sure what point you were trying to make - that theistic religion is not the only root of all evil? We can all agree on that, I think.