Historical truth is not the only kind of truth, and historical narratives are not the only kind of narrative which convey truth.

Is War and Peace a particularly accurate account of the war with France? Does that stop it being a true guide to that time and to the people of that time?

The fact that the Bible is bound as one volume tempts people to think of it as one book, both those who would treat it as a history and those who would see it as a lie. In fact it is a library containing a whole range of books of many different kinds.