Madhairday and I have been plotting behind the scenes to have this debate as we think it will be interesting, both for us and for others.
Mad is a Christian & I am an atheist. I will leave it entirely up to her to present her case.
Mine is:
It's impossible to conclude that Jesus actually existed at all given that there's simply no evidence to work with. I am aware that the majority (although not all) of scholars, both secular & religious, have concluded that he did exist, but this is for inferential reasons not evidential ones, so the issue is nowhere near as cut and dried as many people suppose.
While I am generally happy to accept that there was some man, probably called Yeshua/Joshua/Jesus, who lived in the Galilean region at the beginning of the 1st century & who may have died by crucifixion at the hands of the Romans - I don't feel that this is particularly significant or justifies anyone in believing that he was divine.
I also believe that nearly all of the "Jesus story" - the nativity, the miracles, the resurrection etc is complete myth and never happened at all.
I have continually pointed out on many threads that "There's no evidence that Jesus existed" and been called ignorant and so forth. So, this is my opportunity to make my case and demonstrate that this is, in fact, a correct statement.
So, I'm kicking of this (hopefully) interesting discussion with:
There is no evidence that Jesus the man existed. Discuss 
(By the way, this is an open discussion for anyone to join in, ask questions, make points etc, it's not just for Mad and I).