The narrative described in the OP (I know it's not your position, stormcrow) is obviously nonsense. When atheists and monotheists duke it out, both inevitably try to claim Einstein and foist Hitler on the other side, unless they're also white supremacists in which case, vice versa

There's no evidence Hitler was an atheist, but neither was there anything particularly religious about the Third Reich, and while Einstein disavowed simplistic "Sky Daddy" theism, he was a keen spiritual seeker with ideas of his own.
Now, atheists like the one JoS linked also try to use the fact that the theists mentioned Hitler to take Mao and Stalin off the table--presto change-o look-o over there-o. Oh, they were building a cult of personality which is practically like a religion. Oh, they just wanted power. Oh, they weren't
real atheists.
Sorry guys, but they were also leading pro-rational, scientific positivist movements advancing under the narrative that religion was holding back progress. They certainly weren't secular humanists, but otherwise they professed many of the same values avowed by contemporary atheists, and are quite appropriate to bring up when atheists try to claim that fanaticism and its attendant atrocities are strictly religious phenomenon. Their massacres are not evidence that atheism is bad and wrong, but by extension neither are the Inquisition or the Crusades evidence that religion is bad and wrong. All of the above are examples of fanaticism and lust for power run amok.
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