So then someone might say....aha...but then we can use it to interpolate some other facts we did not know....
Well...DEFINITELY NOT.... since you cannot use Sherlock Holmes to interpolate from it any facts that you can be sure are not FABRICATED to make the story plot more interesting or flow better or better serve the purposes of the writer.
Well sure you can use Sherlock Holmes to improve your understanding of history.
Sherlock Holmes books are just artifacts, like shoes or pottery or boats or garbage heaps, whatever you got.
And like all artifacts, they have something to contribute to our knowledge of the past.
Where were these printed? Who printed them? Why? What were they printed on? Who read them? To what extent are the descriptions of the times accurate, and if they're highly accurate, can they fill in any holes in our current understanding of the place with possible answers, especially any that we can look for other types of evidence for?
The Bible has a whole bunch of genres included in it, from religious visions (which do help us learn things about the history of the real world) to different types of law, folk tales, love poetry, building specs, genealogies, epic poetry, origin myths, and on and on.
Some of it is pasted together from much older material, so it has redactors instead of authors. Some of it is forged for political purposes (e.g. Deuteronomy). Some of it has a single author.
And of course, it's all written from these folks' ancient, highly religious, distinctly Jewish (and later Christian) point of view. A point of view which, btw, also tells us something about the real world.
So if you look at the layers of, say, commandment myths (there are several, spanning the nomadic to the priestly period), the war legends, the development of the law, sure, you learn something. You can learn a lot, in fact.
Triangulate it with other ways of investigating the Ancient Near East and its peoples, and you can learn a great deal.
For people 2,000 years from now, copies of Sherlock Holmes might be quite interesting and informative. You never know.