Do you ever go through the math of the holocaust? It doesn't add up.
I mean, you'd have to kill 4106 people every day, from the very beginning of the war to the very end. Non-stop, 24/7, no interruptions no matter what.
Also, do you know how much fuel it would take to cremate 6 million people? Even if they had the fuel, it would take 1.5 to 3 hours to cremate just one body.