The academic concensus amongst the vast majority Historians and Scholars is that the histriocity of Jesus is not in question as an historical figure....even rabid critics like Richard Dawkins accept that Jesus probably existed.
It cetainly is not a fact that Jesus was an accepted fictional character such as Harry Potter and to describe him so is disingenuous and not accepted by historians.
There is a huge difference between acceptance of the historicity of Jesus and the acceptance of the histriocity of The Christ, something that many biased critics intentionally gloss over when discussing this.
That Jesus was a historical figure is accepted academically....that The Christ was a historical figure is not...
Pontius Pilate for example had no extent proof of his existence, until they found the Pilate Stone in the 1960s...does that mean he didn't exist prior to 1961?
I don't have the time to give to discussing this at length at the moment but the
wiki page and
Historical Jesus page will give you a basic outline as to the current consensus among Historians.
Also you must consider the difference in methodolgy between historians of different era's, a modern historian has eyewitness contemporary accounts and such, whereas the ancient historian employs a different methodology, and not only to Jesus but to all historical figures....the wiki links will illustrate this.