or
At best, Jesus is alleged to be "historical" in the way Robin Hood and King Arthur are alleged to be "historical".
Well to be fair the evidence for Robin Hood being "historical" is the strongest of the three.
First we must understand the Robin Hood we know with King Richard I and all that is effectively a 16th century invention.
The earliest surviving ballads of "Robin Hood" was originally set in the time of a 'King Edward' but it is not clear if this is in reference to King Edward I, II, or III or one of the earlier Edwards such as Edward the Elder (900–924), Edward the Martyr (975–978) and Edward the Confessor (1042–1066)
More over there are actual legal records regarding a Robert Hod becoming outlaw from 1226 though it should be mentioned that outlaw and bandit are NOT the same thing. Becoming outlaw meant you were ostracized from your community or effectively a wolf's head who could be killed with no retribution.
Compounding matters is it appears "Robin Hood" served as stock name for an outlaw goes back to 1262 mudding matters ever further.
Terry Jones in the Outlaw part of Medieval Lives goes over the culture dynamics of what made the Robin Hood legend.
The real Robin Hood was likely nearly 180 degrees from the legend possibly a part of that ultimate English medieval nightmare a 'free company'. These were bands of knights who roamed the countryside for neither God or King but to line their own pockets. If you think 'Medieval Mafia' you wouldn't be too far off the mark.