So, Jesus existed - nice of you to concede that. But didn't rise from the dead - and why ? - because it seems unbelievable. As incredible as forgiving your enemies. This is the attraction, the impossibility of it all.
It seems to me that if you are the son of god then walking on water, raising Lazarus from the dead, is all so much of a doddle. Just because it seems implausible to us doesn't make it any less factual than, say, Caesar invading Britain. I ask again, silently to myself - why make it up ? What would be the point. And making it up 4 times in slightly different ways, and doing it really badly, like not producing a corpse when it was most needed.