Sentence:  "Biblical scholars tell us that the idea of a purely evil being like the Devil or <WSD>Satan</WSD> was a late development in the Bible. In the book of Job, <WSD>Satan</WSD> was the heavenly district attorney whose job it was to test the faith of those who, like Job, were specially blessed." / "During the Persian conquest of the Israelites, the <WSD>Satan</WSD> of Job became fused with the Zoroastrian dualistic theology adopted by the Persians, where two opposing forces, one of good, Ahura Mazda, the Supreme Creator deity, was in a constant battle with Ahriman, the absolute god of evil. This polarized dualism was present in the theology of the Essenes and took hold in Christianity where God and his Son Jesus were in constant battle with the highest fallen angel, <WSD>Satan</WSD>, for human souls. This dualism persists today only in fundamentalist religions (Muslim terrorists, the Taliban, the extreme Christian Right and a major part of evangelical Christianity)." 
Meaning of the word marked with <WSD> tags:  The supreme evil spirit in the Abrahamic religions, who tempts humanity and rules Hell; the Devil;  the same figure, regarded as a deity to be revered and worshipped.