I can't deny that Satanism developed over time, but denying that Satanism come out of Judaism and Christianity is denial of truth.
@RayofLight No I didn't read any books but I suspect these books may distract from the origins of Satanism, at least so it seems according to your responses so far.
Satan like characters were part of religion long before christianity was even thought of, and before Enoch picked up a pen. For example Ahriman in Zoroastrianism and Apopis in Ancient Egyptian religion, Hades in ancient Greece, Pluto in ancient Rome All Christianity can claim are the names, Satan, Lucifer etc.
Even the vision of Satan's domain was not a thing until the 13/14 centuries with the works of Hieronymus Bosch and Dante Alighieri.