I think Jar is the only 'Christian' I have met whose faith doesn't depend on an historical Jesus.
Kinda true. The club we call Christianity is based on an assumption that there was a historical individual Jesus and that that individual likely influenced a lot of people.
To that extent, to belong to the club "Christian" you must at least believe that Jesus did exist and that Jesus is actually pretty much who the stories claim he was.
What I have said though, is even if the stories are nothing more than tales told round the campfire, the lessons and message contained in them are still valid.
If it were proven that the character "Jesus" never really existed, was totally a creation of fiction, then the Club would need to take a look at some of its bylaws. That would not necessarily mean Christianity would cease to exist as there are many examples of clubs and organizations based on fictional characters, from Trekkies to The Baker Street Irregulars.
What I have pointed out though, many times here at EvC, is that even if Jesus historical existence could be proven, even if we found the expense report entry for five loaves and two fishies, it would not address the question of Jesus Divinity.
Aslan is not a
Tame Lion