Well, you have my sympathy. I’d love to know if you manage to finish the whole thing. I read a few when I was writing a paper on Christian fiction for library school, and a few after that in a sort of horrified fascination, but I couldn’t take the whole series, esp. the Second Coming one. I do enjoy bad writing from time to time, but it got too painful. The worst was how they would spend 60% of the book narrating some short episode in excruciating detail, then skim 6 months for the rest of the book, then end on a sort-of-cliffhanger.
I did look into the theology a bit at the time, and from my (very basic) understanding, it’s a fictional treatment of a religious idea that first came up in the 19th century and was popularized in the 70’s. Before that, no one had heard of the Rapture as described by this scenario, and it’s limited to Evangelical Christians. (BTW I’m a lifelong Mormon, and a few months before I started this paper I had to ask a friend what that bumpersticker meant about the Rapture and the vehicle being unmanned, what?–I had never heard of any of it.) I can’t remember the details now, though, of how the whole theory all got developed. I know it’s based on a very literal reading of Daniel, Revelation, and a few other books, which is then all mapped out in great detail, but they take verses here and there and put them together in a certain way to get it.
I think “The late great planet Earth” was part of what got the whole thing going in the 70’s, so you might want to find a copy of that to look through. Evidently it made a huge splash in the Evangelical community, but I don’t know more than that and I have to go to bed now.