FF . . . those verses are not addressed to HaSatan but to Nevuchadnettzar the King of Babylon, who thought he was the most powerful being in existence. He wore a resplendent shiny robe which is why he was addressed as "Heylel ben Shachar" (translated in the KJV as "Lucifer son of the morning"). This is the planet V*nus. Nevuchadnettzar is being sarcastically asked if he is the planet V*nus fallen from the sky. The planet V*nus is the only "lucifer" there ever was. There was never a fallen angel named Lucifer who rebelled against G-d and fell. Never. This comes from the "new testament" ("I saw Satan fall like lightning from the sky") and is naturally imposed on Isaiah by chrstians. I would not be one bit surprised that there are actual "luciferians" who worship this nonexistent "fallen angel," but like Satanists, these "luciferians have chrstian beliefs and merely root for the other side.
BTW, as powerful as Satan is (aren't all angels powerful?) he is not a counterpart of God because he is not infinitely powerful.
As an angel, the Satan carries out his duties . . . nothing more.
Please, don't get aggravated. I am not being sarcastic at all. But if I believe the Bible is the inerrant word of God, I surely need to know exactly what it says, not what other people say it says. Thanks for your patience so far.