Think of it as Siamese souls. Inseparable, but two personalities, two individual experiences, and a shared brain from Connor's body. Although Connor and Adam will be able to communicate and cooperate, I decided I prefer them to remain two beings sharing one soul. Initially, Connor's body is born with Adam's soul, except Adam is asleep. Baby Connor sets up shop in the same soul, and he doesn't know about Adam. Connor lives his life "normally" (heh) aside from being the son of Satan and, therefore, the Antichrist.
At the end of book one, Connor is unable to kill the pope for reasons he can't understand. That was Adam's first influence on this "dream" he's having, meaning Connor's life. During book 2, Connor will become increasingly erratic (details TBD) as Adam slowly awakens and tries to reassert control over his own soul. Connor doesn't know what's going on, although he's struggling internally not to lose control of himself because of whatever is happening. I may do something similar with Adam (i.e., he's coming out of his slumber and is trying to shake off the dream and reassert control over his conscious self, but he can't do it because Connor is fighting him).
Most likely, Adam will fully awaken before Connor learns what's happening from the Holy Spirit. I decided tonight, there should be a chapter where Connor and Adam "meet" and get to know each other, at least to some extent, and figure out how to coexist, at least until external matters are settled, at which point Adam and Connor expect to have some sort of duel to decide who lives and who dies. I'll use that chapter to explain what's been happening to the reader. I'll probably go further and have much of what's happening surprise Adam as well. I might make Connor's whole existence within Adam's soul part of that surprise. Perhaps Adam believed he would be fully conscious of who he is right from rebirth. So Connor could be a huge surprise (not to God, but to Adam). There's other stuff I'm still working out, but Connor's courage is critical to the success of the mission, so Connor had to come into existence. How Connor came to co-exist in Adam's soul is TBD. I'd prefer a different explanation than simply saying God did it; obviously God knew it would happen, but I'd like a different root cause.
Before all of this begins (before Connor is born) Adam is unwell, psychologically, blaming himself for what happened in the past and asks God to end Adam's existence. I'll probably make it so that the rescue mission was God's idea. God knows Adam's soul is sick and needs to be healed, and the rescue mission is meant to accomplish that by allowing Adam to fix what he screwed up.
Now you see why there had to be a whole different timeline for this story. Obviously, book one tried to follow Catholicism as much as possible, although it looked for quite a while that Christ had returned as a boy. Catholics have far more flexibility than some Protestants denominations when it comes to interpreting Revelation. Most notably, events in Revelation are not meant to happen sequentially, and some events never happen at all but are symbolic of other things (e.g., the Two Witnesses from Revelation simply represent the Church's witness to the life, death, and resurrection of Christ; traditionally, two witnesses were needed in the Old Testament for testimony to be considered reliable).
Book two will be mostly consistent with Catholicism until it's revealed near the end that there are two "beings" struggling for control of the same body and soul. At that point devout Catholics will think the whole story has gone off the rails and the book reviews will tank. At that point Catholics will begin to look more favorably on Dan Brown. :-) I do intend to make it clear in the introduction of all three books that the story is inspired by Revelation but will not necessarily follow Revelation to the same conclusion. It definitely won't.
Book three will involve many of the natural disasters from Revelation (they may actually start in book two), followed by a confrontation between Satan and Connor, not a confrontation with Christ, the latter being considered non-Catholic. You can probably guess what happens to Satan, although there'll probably be another 25% of the story to go after that, which focuses on the rescue mission, involving a huge sacrifice, the mission's outcome, and its aftermath.
And just to make it interesting, I'll say that only one of Connor or Adam will remain for the rest of eternity. :-)
George's head is probably spinning right about now.
Did I answer your question, Kdot? lol