I think the two of you are confusing fictional with fictionalized. Sherlock Holmes is fictional but the FDR in FDR American Badass! is fictionalized.
I have in the past asked about viewing the Gospels and Acts as the 1st-2nd century equivalent of Dime Novels and Penny Dreadfuls that starred Buffalo Bill, "Wild Bill" Hickok, and Annie Oakley.
In fact, this is how in 1982 and 1995 the International Standard Bible Encyclopedia defined the Christ Myth; story of Jesus not the man himself "possessing no more substantial claims to historical fact than the old Greek or Norse stories of gods and heroes"
Yet we have stated that stripped of its supernatural elements the 12 labors of Heracles are plausible but that doesn't mean that there was a historical Heracles.
As I have pointed out over 100 years ago Remsburg postulated a historical Jesus where the Gospels were in "the narrative is essentially false" side of the historical myth spectrum ie a "historical" Jesus on par with historical Robin Hood or King Arthur.
Remsburg implied that Jesus (if he did exist) was slowly woven into various mythical motif stories after his death. We see this with Apollonius of Tyana for whom we have better evidence for existing as an actual person but he was around for a long time (at least 70 years).
Right now the historical Jesus has been minimized to someone who preached something in Palatine in the 1st century and was killed by either the Romans and the Jews. With that kind of criteria one could claim the Samaritan prophet in Jewish Antiquities 18.85-87 was Jesus.
As even Schweitzer admitted the efforts to find the "real" historical Jesus have turned him into a ventriloquist dummy ie an unconscious self portrait. I agree with Price in that "even if there was a historical Jesus lying back of the gospel Christ, he can never be recovered".
There is simply too much myth and too little untainted "evidence" to show just who Jesus really was or even if he actually existed.
I don't think anyone is missing the distinction as far as the definition of the two words is concerned. We know what the words mean.
Personally, as it's presented, I don't see that that there is any practical difference between the two definitions as far as a human Jesus is concerned. In neither case is anyone identified as a human person doing the things in the bible settings. That figure, fictional or fictionalised, was not known to anyone who wrote about him.
Just on the earlier question of how we could ever show that Jesus was fictional - again that's just a question of credible evidence. So, for example, if in the future we find very early manuscripts, reliably dated to say the 1st century, where the manuscripts are clearly the forerunners of the biblical writing, and where they make clear that Jesus was originally thought of as a spiritual figure or heavenly messenger (or however anyone wants to describe that), and not as a normal human preacher of the time, then that would be clear evidence of how the Jesus stories originated from a fictional belief.
There are any number of options like that. E.g., we might find accounts of earlier pre-Christian religions from Greek, Persian or Roman influences in that region, where a central deity is described in terms so similar to Jesus as to make it obvious that such earlier beliefs had strongly influenced the later Jesus stories.
But before anyone says that is all speculation and that we don't have any such earlier writing. Firstly its just a straightforward answer to the question of what it would take to show that Jesus was very probably fictional. And secondly, we do of course already have all sorts of writing like that, with all sorts of similarities to Jesus. But it's just that, whilst sceptical writers such as Carrier, Doherty, Wells, Elegard, and countless others clearly do see such earlier writing as suspiciously like the forerunner of the Jesus stories, the Christian church and bible scholars do not accept that such earlier writing is convincing as evidence of how the Jesus stories originated.
So that becomes a matter of opinion. But it all hinges on how clearly any such earlier writing contains unmistakable elements of the Jesus stories. As I say, if one day we find some really clear and unmistakable writing of that sort, or if re-interpretation of existing material shows beyond all reasonable doubt that the Jesus stories came from earlier religions and earlier beliefs (e.g. the OT), then that would in the end be impossible for the Church and bibles scholars to ignore.
