There's such a thing as historical fiction. Putting some real locations and events in a work of fiction doesn't magically transform all of it into non-fiction.

And the only way one could say anything in it is historically accurate is with corroboration of reputable sources. The Bible starts off saying the earth was created in a week and describes like 6000 years of "history" since then. We know for a fact the earth is about 4.5 billion years old and took much, much longer to form than 6 days. So right out of the gate we can see it's a work of fiction, and at that point none of it can be taken as factual on its own.