Well, it is my very subjective impression that most people don't actually put much thought into exactly what they believe and don't have all that much of an idea exactly what they believe in. They believe it's true, but they don't know what it is. Which is weird IMHO.
E.g., what is a soul? Is it basically life? Well, a lot of people even among the theists can easily imagine something living without a soul (e.g., undead or animals; even people who somehow lost theirs or stored it somwhere else or whatever are common literary characters.) E.g., is it consciousness? Well, ditto.
I even talked to someone who really didn't argue more than that there is some unspecified "energy" that you have when alive, and it must go somewhere when you die, because the 2nd law of thermodynamics says so. But at that point that energy doesn't have to be conscious or anything -- and in fact energy never is -- and his afterlife doesn't have to be more than an energy sink. Heck, even heating the universe a little would qualify.
And that goes double when people (not Rose so far, but we are talking more general theist beliefs) make nonsense statements like "God is love" or "Jesus is the Truth" or C.S.Lewis's "God is goodness" or such. I haven't found anyone who can explain or seems to have the foggiest idea of how a being can be a state or property.
Or take John's having the Logos incarnate as a human and die on the cross. Given that Logos was the reason that keeps the universe working, or akin to what we call physics these days, how would that even work? And wouldn't the universe stop working while the Logos was dead?
The RCC had two millennia to think this kind of stuff up, and even they routinely retreat behind 'it's a mystery' when asked to explain it.