To be honest I didn't spend much time listening to the discussion about a dead body reanimating and having a walkabout. It may have been at part 4 that I started to watch closely.
You may already have seen this, but if you haven't, you might like it:
How a Fictional Jesus Gave Rise to Christianity
By R G Price (not to be confused with R M Price)- 11/23/2014
http://www.rationalrevolution.net/articles/fictional_jesus.htm
I expect you'll find it more persuasive than I do, but I do still find it interesting.
One of my issues with it is that when you go to the OT passages than he cites as parallel with the NT passages, many of them aren't really all that parallel.
And of course, finding parallel passages in the OT is arguably just what the writers of the NT gospels were doing, but possibly not because they didn't have a figure to apply them to, but possibly because they did, or felt they did, and they were looking for (in some cases ropey) justifications.
Again, hard to tell if it's all fiction or not. 'Generally not to be trusted' is fine by me (same goes for Paul as well).
The gospels are unlike the epistles, which don't easily fit the same genre. That's not to say they can't be argued to be (the epistle form was used for fiction, just not in that form) which is why I'd prefer talking about the epistles than the gospels, generally. Sort of the reverse of you.
That's without assuming anything about the epistles either, including the given datings, obviously. But as someone once said to me, they are about something, and it's not a recipe for banana bread.
So if, like me, one doesn't easily buy into outer space Jesus, they are likely about someone. Well, someones, if you include the prior Jerusalem group, which I lean towards taking as the original Jewish followers, doomed to more or less oblivion, apart from when Acts (and later orthodox writers) have to at least mention them.