I tend to think of a cult this way–if it was made recently, especially in the 19th or 20th centuries, has a unique doctrine based on specious use of whatever religious text being used or uses visions/hallucinations/visitations/golden plates as a reason for whatever doctrine. Using this doctrine makes me classify the ones that are pretty obvious–Heaven’s Gate, Branch Davidians, Scientology–in with ones that some people I know would be angry with me classifying them as–Mormons, Jehovah’s Witnesses, Christian Science, etc. Also, I think a really radical, superliteral, and otherwise just whacked interpretation iis a good sign–like the Jehovah’s Witnesses and refusing blood transfers. I believe the reasoning is a overly-literal, out of context, reading of some parts of the Bible.
Now I know that, for example, the Protestant churches are newer than the Catholic and Orthodox churches and what have you, but I don’t think they can be classified as a cult because they are taking basically the exact same beliefs and works and just see them slightly differently. It’s just a different way of answering questions like “How is one saved?” where the answers, depending on the particular denomination are generally either by good works, worship, etc. or salvation through the grace of God alone.
That’s why I throw in some of those other groups. Mormons have that whole Book of Mormon thing going on, for example. I don’t think it’s reasonable to expect to put next to the Bible, a book that has had hundreds of years of oral tradition before any of it was written for the Old Testament, with it being a little bit of everything, not just a religious text, and the New Testament, which has not had as much editing before writing as the OT, but then again half of it is the history of Jesus and his disciples, and the rest are letters on interpretations of the Gospel. To put next to that something that was written in the 19th century, claiming that it was written by God on golden plates and translated by a divinely-inspired and guided American is ludicrous. I mean, the Bible wasn’t divinely inspired or guided, and yet some guy who comes out of nowhere and to claim that this, also, is the Word of God and then expecting for the mainstream to accept it is complete fantasy.
Sorry, I got off on a bit of a rant there.
Anyway, I’ll suggest you try reading James W. Sire’s Scripture Twisting: 20 Ways Cults Misread the Bible and go from there.
I got to hand it to Hubbard, though. He said the best way to make money was to invent a religion, and he’s done that. Why can’t I make up a BS religion and get Hollywood to flock to it?