Ok Mike, I'm not sure how this thread turned to the videos you posted, but your PhD is wrong, plain and simple. His very first premise about why the Gospel was written in the first place is dead wrong, and he's very assuming in the statement. In other words, he never seriously considered it.
Next up, people have taken to the profession that Scripture is Divine "in it's original autographs." Take that as you will but the errors and issues you have raised are petty. Not a one of them has substance. It's a non-issue.
Next, whoever it was that objected, had a valid issue. If you need to turn to others, this is no longer your concern(s). We're not here to help Google explore Christianity, and the *cough* "Bible scholar* you presented certainly has no interest in exploring Christianity. (He was a poor choice, btw)
Your interest in this thread was stated as "why is hell necessary?" That could reasonably branch off into several areas. Some of them might prove interesting?