It's always entertaining to see people go back and forth over some shyt that nobody has solid knowledge of, because that knowledge doesn't exist. The best thing you can go off of is written text, and you still gotta consider the fact that that author's imagination was prolly impressive enough to make more simple minded people accept those texts as if they were historically accurate.
I would assume dinosaurs and evolution are the facts because it's no way we would go thousands of years without a whistleblower to say otherwise. Best argument against it is books written by more guys with dope imaginations. We don't know, though. 2nd best chance is that humans are an interstellar race that found earth and tried to establish a home base there and failed, so they abandoned the whole plan and left us here