Sorry I'm late to the party!
Who the Hell is Satan?
Here's my understanding of this "Old Enemy" as the literary scholar Neil Forsyth coined and what I consider to be the foundation of what is called Satanism.
Satan has always existed, only under other names and guises, Satan is a powerful and primordial archetype of man's psyche . . . a meme, or what some may now call a "Godform", I think the Magus of Chaos, Peter Carroll uses that term?
This archetype is the reflection of how we perceive ourselves in relation to what we call the "others". Satan is a social and cultural phenomenon as old as the mind of humanity itself. There has always and will always, be essentially two worldviews consisting of oppositions and they are "Us & Them" or "Me" and "the rest of you" . . . etc.
Sumerian and Akkadian tablets concur this worldview from the earliest known writings, the ancient Egyptian word for an Egyptian meant "human", which excluded all who were not Egyptian to be relegated to 'non-human', the Greek word for non-Greeks was "barbaroi" (barbarians). The Jewish Essenes called anyone not an Essene "ha satan" (the adversary), Zoroastrianism set forth the dualistic "good" (what we believe in) and "evil" (what they believe in).
"A society does not simply discover its others, it fabricates them, by selecting, isolating, and emphasizing as aspect of another people's life, and making it symbolize their difference"
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- William Scott Green
(Professor of the history of religion - ancient Judaism, biblical studies, and the theory of religion).
So, who/what is this Satan? He simply is who you are not!
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IAMTHATIAMNOT
Etu Malku V° HH☿D