Yes, Livgren had been raised Lutheran but never really accepted Christ until ca. 1980. Prior to that, he had been studying Urantia, which is a New Age quasireligion that does have Jesus as a character in its 2,000-page volume.
I don’t remember any of them, including Livgren himself, talking about his conversion, and the story does pretty much end with the “Monolith” album and changes in the original personnel.
Oh, and VH-1 wanted to do a “Behind The Music” on them, but scrapped the project because the band members didn’t have enough hard-luck stories for them. One of them lost an eye as a child but he dealt with it, there was drug use in the band but AFAIK nobody became addicted (except for Steve Walsh, from what I’ve heard), a couple members got divorced but they said that would have happened no matter what they did for a living, that kind of thing.