Yeah. From the conservative evangelical Protestant perspective, at least, inspired Scripture must be 100% true, non-fiction. After all, if the book (Job, for example) doesn't portray itself as fiction, then God would be deceiving us to give us something which reads like an account of real events and yet isn't.

Now, that assumes that

inspired Scripture must be non-fiction
Job, etc portray themselves as being historical accounts

and probably other stuff. But that's roughly the idea, I think. On the other hand, usually in the context of combating Left-Behind-style Revelation-interpretations, there's been an increased occurrence of preachers, at least in the conservative Reformed branch of things (that being my particular part of Christianity), talking about interpreting things in context and understanding genre (in Revelation's case: Apocalyptic Literature).

Actually, also in the context of evangelicals who think evolution's okay - same thing about genre - So who knows where this will go. Maybe in the next few decades it could become acceptable for an evangelical preacher to say Job and Jonah are fiction and inspired Scripture - but I wouldn't count on it.