I know that many pagan rituals have been "Christianized" by the Church in the past, which was actually a good idea, took something bad and used it to remind of of Christ(e.g. Christmas Trees). But honestly the "Roman Bablylonian Brotherhood" theory reeks of conspiracy theory stuff. I wouldn't call it simple history at all.
No. It's fact. Like I said, it happened back during the Inquisition. Rome needed the Church to fight. The rituals bled over into Catholicism. That's why they're not found in the Bible.
Today, there's still a Babylonian Brotherhood, but I have no idea what they're up to now.