The torture, the sex crimes at all levels, reducing humanity to chattel and ash. If there's a god that approves of any of that, I'm staying atheist (in fact, the "problem of justice" is a philosophical argument against god, and that applies very much to the holocaust).

Depends on which group of people. The Cannanites are fine, but Jews were a no-no!

Let's assume god was ok with someone ordering the extermination of an entire group of people.

Don't need to assume, we know for a fact he endorses it.

Deuteronomy 20.

16 However, in the cities of the nations the Lord your God is giving you as an inheritance, do not leave alive anything that breathes. 17 Completely destroy[a] them—the Hittites, Amorites, Canaanites, Perizzites, Hivites and Jebusites—as the Lord your God has commanded you.

A separate fun fact, zionists believe Palestinians are the descendants of amalek. I'll leave what that implies as an exercise for the reader.

Well, God IS quite okay with genocides, AND he killed Hitler. Of course he went to heaven

According to whom? (Referring to suicide being a no-no. This is not Holocaust denial.)

Not sure we were all told he killed himself. Who knows someone else could of pulled the trigger. But regardless no way he went to heaven. He would have never asked for forgiveness but in his mind he did nothing wrong.