I happen to be reading The Occult Roots of Nazism by Nicholas Goodrick Clarke at the moment and you have some facts wrong, firstly Hitler was not the main man (religiously speaking), he was just an outright fascist; secondly the occult and pagan belief system they twisted was folkish Heathenry based on an ideal of the Aryan, it had nothing at all to do with Zeus. The concept of Zeus being some fantastic god that all pagans bow down to is pure propoganda from Roman historians, Victorian misrepresentation and the US obsession with Ancient Greece. The "Nazi" brand of Heathenry first emerged in the mid 19th century and was the driving force behind the Second Reich and the later movement to a more democratic society in what was then an almost feudal collection of principalities and in parts the Austro-Hungarian Empire. It was the break up of this empire that then lead the likes of Himmler to use runic symbolism and the Story of the Volsungs to create a new national identity which culminated in Hilter's Third Riech. This religious system was not the only cause of anti-semitism, Hitler himself had lived in a Jewish ghetto where most of his political ideaology was born completely seperate from any occult references as he cleary states in his own book "Mein Kampf" (maybe you should read that before you believe what you see on the History Channel, or should I say pseudo-History Channel). It is true however that the religious members of the ruling Nazi party did build shrines and temples, paraded around in medieval armour and wished to see a return of the "Noble Heathen Aryan". The murders were however completely politically and financially lead. I own a 1930's German postage stamp which has been marked as 3,000,000 Marks, this inflation and financial disarray was blamed on Jews and their removal from society proved to work, not because they were responsible but because of how they were removed. Less people equals more money and when you have the added bonus of slave labour your economy is bound to do well. Overall this was a pretty sick remedy to the problems the nation was facing after WWI.
Stalin and Mao were both communists, which is almost a religion, however their behaviour was to retain power and rule by fear. They also used the same social and economic models tried by Hitler. Again this was not a good thing to happen and should have been stopped. Communism is a political system with a lot of potential for good but was so quickly corrupted after the 1917 revelution in Russia that it became Stalism and Europe only ever saw a short lived success of the "equality ideal".
If you are going to rank the killing I believe it is 1. Stalin, 2. Mao and 3. Hitler.
Did "Christian America" decide that the Japanese had no soul when they dropped two atomic bombs on them? Let's face it the US is the only nation to have ever used "Weapons of Mass Destruction" and they claim to be a Christian nation...
I'm a practising Norse Heathen and dedicated anti-Fascist; we have to know the history of our faith so we can defend ourselves when wrongly called Nazis.