That is not logical. That is dodging the question. There has to be a separation, events are either factual or allegorical. They are mutually exclusive.
I could certainly accept the possibility of a Jewish teacher in that era. The myth is a entirely different matter.
As I quoted Allegro.
"Even if there was a sectarian Jewish teacher living in Palestine during the first part of this first century called Joshua or Jesus he had nothing at all to do with a crucified Christos of Paul's theology. Thus had no part to play in the formation of that distinctive amalgam of faiths that eventually swept the world."