I still think much in missed in all of this. Instead of talking how its impossible to prove a negative (which is not true anyway) or looking at various aspects of plausibility, most focus should be on understanding how a claim originated in teh first place.
If we are talking about bigfoot and a specific claim about bigfoot existing in the woods of California, then of course we have to look at the source of the claims and the source of the belief that there was a "bigfoot" creature walking around in the woods. So when you look at stuff like the Patterson-Gimlin film (
https://en.wikipedia.org/wiki/Patterson ... imlin_film) and conclude that its a faked film with a guy walking around in the suit, that's evidence that big foot doesn't exist. From analysis of that film we can conclude, at the very least, that THAT "version" of big foot never existed, rather belief that THAT concept of big foot was real and existed resulted from people viewing a hoax movie and believing that it was real.
We don't need to be able to go back in time to that location and deforest the area to prove that such a creature didn't exist, all we need to do is prove that the film is a forgery.
Its the exact same with Jesus or any other figure. The Gospels are essentially an ancient version of the Patterson-Gimlin film. When we can demonstrate that the Gospels aren't an account of the life of a person, rather they are literary constructs, then we have essentially proved that Jesus didn't exist, period.
What some people now try to do as the Gospels are increasingly picked apart, is say stuff like, "But, how do we know that this entirely fictional story in which we it can be shown everything was made up, wasn't
inspired by the life of a real person."
But this is EXACTLY THE SAME THING as acknowledging that the Patterson-Gimlin film (or any number of other such films) is a hoax, but then saying, "But what if those guys were inspired to make that film because they saw a real big foot and were just reenacting it?!"
At that point its just absurd.
Realistically, right now most advocates of the historical Jesus still hold out the claim that the Gospels are essentially reliable works that are based on the life of a person. There are a few, like MacDonald, who accept that the Gospels are not works based on the life of a person, but who still, inexplicably, think that somehow they were inspired by the life of a real person. To me, that's the most absurd position.
I can understand people who think the Patterson-Gimlin film is real believing in big foot. What I can't understand are people who acknowledge that its a fake, and then still claim that there probably really was a big foot creature living in the area that they took the film. That's the really absurd view, and it seems that there are significant number of people today who take that type of position regarding Jesus.