Apples and oranges. Proving the existence of a deity is not the same as proving the existence of a historical human being. The former I would say is impossible, the latter, in the case of Jesus, possible to a reasonable degree.
As I said before Remsburg said that over 100 years ago:
"Jesus of Nazareth, the Jesus of humanity, the pathetic story of whose humble life and tragic death has awakened the sympathies of millions, is a possible character and may have existed;
but the Jesus of Bethlehem, the Christ of Christianity, is an impossible character and does not exist."
Rudolf Bultmann in 1941 (used by Carrier in his
On the Historicity of Jesus) used the terms Reductive and Triumphalist respectively and Biblical scholar I. Howard Marshall in 2004 used something similar for the two ends of the historical Jesus spectrum.
Taken together you get this:
Reductive theory (Remsburg's Jesus of Nazareth): "Jesus was an ordinary but obscure individual who inspired a religious movement and copious legends about him" rather than being a totally fictitious creation like King Lear or Doctor Who
Triumphalist theory (Remsberg's Jesus of Bethlehem): "The Gospels are totally or almost totally true" rather than being works of imagination like those of King Arthur.
Marshall warned "We shall land in considerable confusion if we embark on an inquiry about the historical Jesus if we do not pause to ask ourselves exactly what we are talking about." and Carrier states "Either side of the historicity debate will at times engage in a fallacy here, citing evidence supporting the reductive theory in defense of the triumphalist theory (as if that was valid), or citing the absurdity of the triumphalist theory as if this refuted the reductive theory (as if
that were valid)"
Somebody wake me up when he stops shouting.
If we did
that you would make Rip Van Winkle look like an insomniac
Though he denies it, dejudge uses the Triumphalist aspects of the Jesus story (born of a Ghost, etc) to argue against there being any historical man behind the story. As I have pointed out before there is strong evidence that 'born of a virgin' was the ancient equivalent of being born with a silver spoon in one's mouth and signified the "extraordinary personal qualities exhibited by an individual".
Various known historical people were said to be born of virgins: Caesar Augustus, Alexander the Great, and Plato. Even the "Pagan Christ", Apollonius of Tyana, who [supposed] personal writings and references to known contemporaries put him in a better position then Jesus got this treatment.
So being 'born of a virgin' in of itself is NOT evidence of Jesus being a total fictional creation.
It is in the mundane non supernatural events that the Jesus story falls apart.
Herod's Slaughter of the Innocents is ridiculous. Given he supposedly had his guards kill all male first borns 2 years and younger mean he basically sat only his hand for nearly 2 years before deciding 'hey, perhaps I should have this kid killed'.
The Sanhedrin trial account is totally at odds with the records on how that court actually operated in the 1st century. In fact a little known quirk of the Sanhedrin court was that a unanimous verdict for conviction resulted in
acquittal - Maimonides, Laws of Sanhedrin, 9:1
Pontius Pilate is totally out of character based on other accounts. Josephus relates two accounts where Pilate's solution to mobs causing a disturbance was brutally simple--have Roman soldiers go out and kill them until they dispersed. Moreover it is never really explained in the Bible why, if Jesus' only crime was blasphemy, Pilate would need to be involved. If Jesus' crime has been sedition, then there would be no reason for Pilate to involve Herod Antipas--or for the Sanhedrin to be involved for that matter.
The crucified were left to rot as a warning to others unless there was intervention on the behalf of an important person per The Life of Flavius Josephus (75)
Given Jesus' short time on the cross and reports of him being out and about afterwards, certainly the Romans might have wondered if they had been tricked. Never mind that theft of a body was a capital crime, yet there is nothing in the reports about the Romans acting on either possibility. Carrier describe how the Romans would have handled the situation and it is totally at odds with the account in Acts.
So when we come to something specific to Jesus we
can check Gospels and Acts are shown to be spouting fiction.