I think "general fiction", though perhaps a useful term in some ways, is unfortunate, as its use here instantly raises the hackles on Bible literalists like myself. It might be a useful term as follows: I can read "general fiction" in two (at least) ways, for entertainment, as I do with Tom Clancy novels and decades ago with Stephen King (about whom I totally agree with JoJ), or I can read it as literature, as I would with the aforementioned Conrad, or Mark Twain, or John Steinbeck. When our daughter was teaching 11th grade English at BJA, one part was a study of Steinbeck's "The Pearl." Read as entertainment, it's an interesting story of poor people suddenly acquiring a treasure, then having bad stuff happen. Read as literature, there's a whole lot more going on in that book.
As a literalist, I hold that the Bible is totally true; even when it quotes the lies of Satan, it does so perfectly. However, the manner in which God had the human authors present His truths is important, and reading scripture as literature (perhaps a bit like the way I read Steinbeck) helps us get from God's word more of what He intends. Not trying to compare novels by even a great human writer with the Bible, but being alert for the same kinds of literary artifacts in each work will aid in our comprehension.