With regard to the OP about Satan in the bible:
What is written about Satan in the bible is most unsatisfactory. It doesn’t give his origin, and it doesn’t describe his ‘fall.’ The biblical witness to Satan is often contradictory and conflates pagan demonology and angelology (picked up mostly from Zoroastrianism from the time of the Babylonian captivity) with Jewish superstition and anti-pagan rhetoric.
In the end, just about every non-Yahwistic spiritual entity in the bible becomes equated with or becomes a minion of Satan: the Serpent in Genesis; pagan gods; ‘Lucifer’ in the above citation (which no serious scholar says is Satan); Beelzebul (-bub); Baal; Mammon; evil spirits; possessing spirits; the Anti-Christ(s) in the letters of John [which does not appear in Revelation!]; and, the Beast in Revelation. There’s little in the scriptural text itself to warrant such conflation, but it happens in the popular mindset.
Most of what is written of Satan is extra-biblical, in works which were never deemed inspired or scriptural by Jewish and Christian authorities.
Most of what people ‘think’ they know about Satan (including some in this thread :dubious: ) comes from works like Paradise Lost which is as much a biblical description of Satan as Star Wars is a textbook on physics.
In the book of Job, Satan (which means ‘Adversary,’ which is used in a judicial manner for the name of one’s accuser or prosecutor) is one of the members of God’s royal court in heaven. When discussing the righteousness of Job, Satan suggests that if all of Job’s possession, family, and health were stripped away, he wouldn’t be all that righteous and would wind up cursing God. God says, “Wanna bet?” and allows Satan to test Job (who, in the end, as much as he laments and demands vindication, never curses God).
But after centuries of extra-biblical development, this divine prosecutor who will present the case against people at the time of divine judgment becomes one who actively tempts people hoping that they will fail judgment. Thus, the Court Adversary becomes the Evil Temptor. That is why, by the time of Jesus, he teaches his disciples to pray: “And lead us not into temptation, but deliver us from the evil one.” (Yes, that is the better translation – the scholarship of the King James version from 400 years ago is lacking in many respects.) The ‘evil one’ is Satan who tempts people so that they will fall and fail in the final judgment that comes when “thy kingdom come.”
Besides taking on the role of the source of all evil (thus the conflation of Satan with the Serpent in Eden); the influence of apocalyptic literature turns Satan into the leader of the evil spiritual army. Apocalytic literature presents a cosmological battle of Good v. Evil that takes place both on earth and in the heavens. (This is the influence of Babylonian Zoroastrianism.) Thus, in the book of Revelation, you have Satan leading the battle against the forces of Good (led by Michael the Archangel).
And that’s about it for scriptures and Satan.
In pop demonology, you have contradictory notions of Satan, sometimes held simultaneously by the same person.
[ul]
[li]he is already completely defeated[/li][li]he will be defeated in the final battle[/li][li]he is imprisoned and punished in Hell[/li][li]he is the caretaker of Hell in charge of punishing others[/li][li]he is using Hell merely as a staging area for his earthly campaign of evil[/li][li]he is everywhere and the source of every single temptation[/li][li]he really can’t be everywhere, like God is, but he’s going after key people, like would-be Saints[/li][li]he will be incarnated (like the Son of God in Jesus) as the anti-Christ[/li][li]he’s already here as the anti-Christ[/li][/ul]
Peace.