One horrible thing that Christianity, inspired by Zoroastrianism, brought is the idea that, in wars, there is one side that embodies Good—the saints, the sword of God—and the other side that embodies Evil—the demonic forces.
Pre-Christian narratives like the Iliad, the Gita, and Gilgamesh tell tales of wars. But there is no such idea that one side embodies Good and the other embodies Evil.
This narrative of Good versus Evil allows all atrocities to be committed to defeat the demons, as everything would be justified in the name of God.
There is a school of thought represented by Abelard Reuchlin, Stephen Robert Kuta, Joseph Atwill, Henry H. Davis, and James Valliant, according to which the Synoptic Gospels are a satire of the war of the Roman-Jewish elite against the Pharisees and the scribes, the poor Jews.
In this narrative, the Pharisees, the Jewish lower class, were the "sons of the Devil" and therefore needed to be exterminated by the "saints" (as the Roman soldiers were called). Jesus was a Roman-Jewish bard coming to announce the judgment and extermination of the rebellious Jewish lower classes, the Pharisees and scribes.
If this is true, this Zoroastrian legacy of the struggle between Good and Evil becomes even more terrifying, as demons were not only the enemies of Christians but also the enemies of the Christian elite.
