Despite the later angel and demon mythologies that followed, the fact remains that the original stories of the "Fallen Angels" began first in Sumer as the "Anunnake" over 2,000 years before the first accounts were written of them in Genesis (the Bible), and the account in Genesis predated by several centuries the many later mythologies wherein actual names were ascribed to both angels and demons (e.g., Michael, Gabriel, Azazel, Semyaza, Lucifer, Belial, Beelzebub).
Thus... despite the current lexicon of angelic and demonic terms and names, all of these were invented millennia after the original accounts and... thus... cannot at all be considered legitimate or historically accurate.
Just as Santa Claus was not originally a fat jolly guy flying around in a sleigh being pulled by eight reindeer with names like Rudolph, Donner and Blitzen (all the invention of Clement Clarke Moore, a 19th Century poet), so also the original "Fallen Angels," later vilified as the first "demons," did not originally have any of the later names given them by writers in the 1st and 2nd Century CE, thousands of years later!
While later religious mythology has "Satan" predating the "fallen angels," yet the very notion of someone named "Satan" (much less Belial) wasn't even invented until centuries AFTER the "Fallen Angels" had already been written about in the book of Genesis.
Thus... again... the original "Nefilim" ("fallen angels") were the historical precedent for the later mythologies of both angels and demons in Semitic religion.
