Who has commited more killings and genocides in the Bible God or Satan?

In ancient Jewish tradition Satan is simply an angel doing the work that God assigned to Satan to do. The word Satan means challenger. With the idea of Satan challenging us, or tempting if you will.

This description sees Satan as the angel who is the embodiment of man's challenges. This idea of Satan works closely with God as an integral part of Gods plan for us. His job is to make choosing good over evil enough of a challenge so that it becomes clear to us that there can be only one meaningful or logical choice.

Contrast this to Christianity, which sees Satan as God's opponent. In Jewish thought, the idea that there exists anything capable of setting itself up as God's opponent would be considered polytheistic or setting up the devil to be an equally powerful polarity to god or a demigod. Oddly, proof for The Christian satan/devil mythology is supposedly found in the ancient Jewish texts that were borrowed to create the bible.

One can’t help but wonder how Christians came up with ... more.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.