I personally have no doubts that there was a Jewish middle eastern dude named Jesus of Nazareth that went around and taught some good things. It's all over history. Where the GP gets off thinking there was no "Jesus the man," I don't know.
HOWEVER....I just have a hard time believing all the myths, such as that he was the son of a God, even though I was raised on them. If you don't think the Koran is fiction, what are your thoughts on the Bhagavad Gita? Egyptian Old Kingdom pyramid texts or other books? The myriad other religious texts I haven't studied?
If none of these are fiction because of logical argument territory, how can you reconcile that?
To be clear, I'm not trying to troll; you seem like a more well rounded Christian than most I've talked to and I would like to hear your thoughts.