Atheist here, but grew up mormon: Jesus is definitely the main character. I’m hazy on the details but it’s even mormon canon that a lot of events in the old testament involved Jesus in pre-birth spirit form (or something idk), or were at least analogous to his life. Joseph Smith and Brigham Young are to Mormons as any notable dead pope is to Catholics - revered, spiritual authorities, allegedly could talk to god, but they’re not worshiped and they didn’t come up every Sunday, they were kind of in the background