Ask a atheist.

[robvalue]

Gotta question go ahead ill answer it. 

Why do you say that Jesus never existed when noted scholars such as Bart Ehrman and historian Tim O'Neill, who are also atheists, have explained how we can know that he did exist?

Conflating historical and magical Jesus again I see. No one would say there wasn't some guy around at the time that you could say it was based on. Any one of the madcap preachers would do. Even the HJ cases are weak as shit and cover barely anything. Ehrman had to practically debate his former self to make the case. We certainly can't "know" he exists, you play fast and loose with epistemology.

If I know a guy called Harry who goes to school and likes to think he is a wizard, does that mean Harry Potter is real if he was the inspiration? You'll dismiss this analogy as stupid but to a sceptic there is very little difference.