If that “system” (note I mean human theology, not actual Christ who does not change) were to be likened to a Mystery Babylon, it would only be a pale shadow of what is going to be roaring down the pike in the Revelation events. We’re spoiled, and I will firmly stand by that statement. Revelation is talking about something that is utterly Christless.
Perhaps the reason why we don’t see so many Mystery Babylons in the evangelical world is because it often shies away from mysteries. That produces a pale, wan semblance of Christianity. Because there are good mysteries too!
The mysteries spoken of is esoteric communication from Satan and his forces. Satan had to go underground after the Garden (crawl in the dust) and now he communicates in such a manner that it is labeled as a mystery religion by those who receive such communication. The Jesuit founder Loyola received this communication while recovering from battle wounds, he said it was a serpent phantom that spoke to him. A lot of the people in the hierarchies of the four dynasties of the end times receive these communications, I believe. It makes them feel special, the use it to get ahead financially, and that's why they're so willing to go against God's Word.