@Witch_Hunter_Siegfired @BowsacNoodle The Babylonian Captivity is a central historical factor in the Old Testament.
“Mystery Babylon” is referred to in the Apocalypse of John (aka Revelation), and it has become the primary name by which the whole category of Initiated Religions is known. So like the Degrees of Freemasonry - religions structured like that are typically understood under the “Mystery Babylon” label.