You do not understand.
To those who believe that Jesus Christ is God made man- a real human being that walked the earth , the incarnate God that created all things- saying that He is just a myth is the most outlandish thing you could say.
You would not post some obscure, self styled scholar who concluded that the moon is made of blue cheese, would you?
But think of this. If there truly is no God, then does history even really matter? Aside from transmitting information that could not be accumulated later by the experience of man (such as Divine Revelation) what is the point of arguing about history?
There is very little means to prove anything about ancient history if we do not believe the testimonies of those who lived at the time.