Objective evidence for the existence of Jesus Christ?

[Brakeman]

And Gone With The Wind mentions Atlanta.  Does that make the novel factual?

Why? Is that the only book you have about the civil war? If it is are you going to deny the Civil war happened? Even fiction can tell is something about past cultures and people.

That's a non-sequitur, The intended comparison is that novel is not factual, not the background war. To compare the two you would have to say that the someone denies that shepherds tended sheep because the bible isn't true, a very silly preposition.
The "purpose" of a novel is to entertain with a writer crafted story and sometimes it contains truths as the writer sees fit. The bible writers' purpose was to con people that they had knowledge of an invisible god and their intention was to use as much knowledge of the times as they had to make it as believable as they could.