I think the Absolute and their followers represent Christianity, or atleast take heavy inspiration from Christianity. If you notice, the symbol of the absolute is a combition of symbols, each one belonging to one of the dead three. i think the Absolute's symbol represents a holy trinity, and the Absolute is Jesus, in the sense that the Absolute is essentially the incarnation of the dead three, in the same way jesus was in the Christian holy trinity.
I think the Absolute is a brand new character, who is the dead three, but at the same time isn't. They are a "what if the dead three had a baby"
