I don’t believe in parallel universes. I acknowledge that multiverses are “possible,” because we cannot prove they are impossible, just like the existence of gods is possible. Its even possible that when when I can’t find the remote, invisible unicorns took it.
The point is, if we imagine a scenario which cannot be disproven, it is “possible,” but by no means plausible. In fact, it has been my experience that human beings are inherently wrong. We are told in school to “go with your gut instict” and “your first impulse is usually correct.” This may be true with multiple choice tests, but not in reality (which is fill in the blank).
While I think “parallel universes” are merely an interesting topic of science fiction, “parallel mythologies” are real. Parallel mythologies are stories which depict the same events, but differently. The Bible is full of parallel mythologies. The three synoptic gospels (Matthew, Mark, & Luke) tell pretty much the same stories, with slight variation in details. However, the best parallel mythologies have entirely different messages between the two myths.
For good parallel Christian mythology, one has to look outside the Bible. Plenty of works circulated around the time of the Bible’s compilation, but few that were not enshrined in the canon survive.
There were gospels which told of a human Jesus, son of Joseph and Mary, who was a prophet empowered with the gift of healing. There were gospels which painted a portrait of Mary Magdalene as the close confidante of Jesus (notably The Gospel of Mary Magdelene). The Gospel of Judas Iscariot says that Judas was instructed by Jesus to turn him in to the Romans in order to initiate the events of the crucifixion, and that Judas was entrusted with secret knowledge of the resurrection. The Jews even have their version of things.
So many Christians know very little about what’s in their Bible, but they know even less about the stuff that didn’t quite make it. I think they forget, in the hurry to follow in their master’s footsteps, that the prints they follow are merely those of followers who came before them, and that the trail of the master is long gone. Christians do not have faith in Jesus, they have faith in those who came centuries later, who defined key aspects of their path of faith.
And if you’re thinking of reconstructing “true” Christianity… good luck piecing it together from what little survived the book burnings.