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The Historical Jesus is undocumented unevidenced modern fiction or modern heresy.
It is like trying to rationalize Superman... he wasn't really a super alien he was just a good journalist who jumped over a fence once to save Lois Lane from a mugger and the story just got exaggerated a little when Jimmy Olsen wrote an article about it many many years later in the Daily Planet.
It is nothing but Cognitive Dissonance Alleviation Casuistry.
What they are doing is trying to somehow still maintain some
FACE SAVING from having to admit that their
culture and society and history has been based upon nothing more than a FAIRY TALE.
So they rationalize that ok, we can throw away the fairy tale aspect, but then there is still REAL stuff left in there and we have not been
UTTERLY AND TOTALLY DUPED for all those centuries by a MYTHICAL FABLE.
In fact not any other fiction based on so tenuous an evidence for historicity, as the gospels, would be so hotly and emotionally debated for the establishment of the real historicity of its magic-wielding demigod supernatural hero and his entourage of hobos.
No scholar gets really hot under the collar arguing vehemently that Arthur was a real flesh and blood person albeit not really at all like he is depicted in the fables.
No scholars of Robin Hood (if there are even any) are constantly in contention over the issue of his historicity albeit he never ever even laid eyes on a Friar Tuck or a big Little John not to mention his mortifying green tights and feathered pointy hats.
No scholars or laity give a damn whether Hercules was based on a real flesh and blood person albeit he was not a demigod nor even could kill a dog let alone a lion.
However, in the case of Jesus, the so called scholars (in addition to the laity of course) are not even aware of their
extreme special pleading in an attempt to assuage the throbbing pangs of a chronic cognitive dissonance on so many levels and variations touching their inner psyches.
They are desperate to prove that it is not all a big hoax like all the other woo they are increasingly beginning to realize is claptrap.
Much like children who are driven to tears and dismay after discovering the level of adult complicity of their society and parents in deceiving them for so long and in so many ways with the Santa fable.
So they carry on ferociously debating against the fictiveness of the Jesus fables postulating tenuous modicums of possible likelihood of perhaps maybe something approaching a near similarity to some kind of similitude of a real person or an amalgam persona who they begrudgingly and with extreme consternation concede might maybe possibly not have had anything magical about him, but
could have been a xenophobic zealously benighted fanatically religious Rabbi or terrorist or freedom fighter or old-new-age hippie or cult leader according to one's own wishful thinking for what one needs this Jesus to be.