Everyone has heard of Biblical Literalists, who hold every word of the Bible to be the exact and literal truth. At the other extreme, there are some people who believe there is no truth to be found in the Bible at all. This is a good example of the "Excluded Middle" fallacy -- the misguided notion that proving a statement to be false is equivalent to proving the opposite statement to be true, with no shades of grey between.
In the case of the Bible, the view of the "non-literalists" is that the entire Old Testament was written as a work of fiction by a Jewish scribe in the 4th or 5th century BC. Descriptions of events taking place centuries before this time are, according to this interpretation, mere fabrications. References to "real" cultures (i.e. cultures that even skeptics admit existed) such as those of Egypt, Assyria, Babylon and Persia, are nothing but scene-setting in what is effectively a historical novel. But what if the references went the other way? Are any of the major Biblical characters mentioned in records left by undeniably "real" cultures?
The answer is that in at least two cases they are. There are two Assyrian artifacts in the British Museum, which I saw on my last visit there a couple of weeks ago, that provide explicit references to two of the more important kings mentioned in the Second Book of Kings. So much for the über-skeptics and their "nothing in the Bible is true" theory!
So at least some parts of the Bible are non-fiction!