Hitler wasn't atheist. Luther wasn't either.

And both were hellbent on killing jews. Truly hellbent. Next time someone tells you that the Holocaust was an evil perpetrated by atheists, show them these quotes:

Gems from Hitler:

Hence today I believe that I am acting in accordance with the will of the Almighty Creator: by defending myself against the Jew, I am fighting for the work of the Lord"(Hitler 1943, 65).

The undermining of the existence of human culture by the destruction of its bearer seems in the eyes of a folkish philosophy the most execrable crime. Anyone who dares to lay hands on the highest image of the Lord commits sacrilege against the benevolent Creator of this miracle and contributes to the expulsion from paradise." (Hitler 1943, 383)

Gems from Luther:

1. "First to set fire to their synagogues or schools and to bury and cover with dirt whatever will not burn, so that no man will ever again see a stone or cinder of them. ..."
2. "Second, I advise that their houses also be razed and destroyed. ..."
3. "Third, I advise that all their prayer books and Talmudic writings, in which such idolatry, lies, cursing and blasphemy are taught, be taken from them. ..."
4. "Fourth, I advise that their rabbis be forbidden to teach henceforth on pain of loss of life and limb. ..."
5. "Fifth, I advise that safe-conduct on the highways be abolished completely for the Jews. ..."
6. "Sixth, I advise that usury be prohibited to them, and that all cash and treasure of silver and gold be taken from them. ... Such money should now be used in ... the following [way]... Whenever a Jew is sincerely converted, he should be handed [a certain amount]..."
7. "Seventh, I commend putting a flail, an ax, a hoe, a spade, a distaff, or a spindle into the hands of young, strong Jews and Jewesses and letting them earn their bread in the sweat of their brow... For it is not fitting that they should let us accursed Goyim toil in the sweat of our faces while they, the holy people, idle away their time behind the stove, feasting and farting, and on top of all, boasting blasphemously of their lordship over the Christians by means of our sweat. No, one should toss out these lazy rogues by the seat of their pants."
8. "If we wish to wash our hands of the Jews' blasphemy and not share in their guilt, we have to part company with them. They must be driven from our country" and "we must drive them out like mad dogs."

Quotes taken from PZ Myers' blog.

Let there be no doubt: the second gravest crime against humanity in the twentieth century was Christian-powered. The first was Mao's bidding, through impoverishment fueled not by atheism, but by communism. Look back in history, and you'll see more examples. To even suggest that atheism had anything to do with them should be regarded as a blatant, bald-faced lie.

None of those crimes against humanity had atheism as their motive. None ever.