I don't think there is any arugment among scientific minds that Jesus was a real person. The argument lies in if he was who people think he is. Now, I'm not scientifically minded, but even among those who are, I don't think they doubt that he in fact existed. As far as pulling actual facts...what kind of facts are you looking for? DNA? Even if there were DNA samples, what are you going to compare it against? It's hard to show that someone existed 2 thousand years ago without some sort of point of reference.