@Tol I'd recommend Did Jesus Exist by Bart Ehrman, he does a good job of debunking the Jesus Myth theory and explaining why historian of the period overwhelmingly believe Jesus was a real figure.
I'm going to be honest Jacob is actually right about this one. I'm not an expert but I know enough about the history involved to say Jesus Myth theory is bunk. It can't be absolutely refuted but it largely rests on misrepresentations of how ancient history is actually studied and long discredited ideas like the pagan dying reviving god.
And dpareja, that's not accurate about historians. First they do have several lines of evidence pointing towards Jesus being a historical figure (Paul personally knowing his brother, the criterion of embarrassment, the general trajectory of how Christianity evolved) and ignores the fact that most of these historians don't believe Christianity to be literal truth.
The dominant view today is that Jesus was a Jewish preacher of the Dualist/apocalyptic movement, promoting the idea that the world was about to end and that poor Jews, not the rich and powerful, were the truly righteous and should resist the Romans and seek spiritual purity over material wealth or their own families. He never believed he was a god, that idea evolved much later.
And that's my challenge for you Jacob. You say why should trust the judgement of historians when it comes to Jesus being a real person, but what about everything else about him? Again those same historians agree he didn't believe himself to be divine, thought the world was going to end thousands of years ago and overall was a very different person then the guy you worship. If you trust Historians on Jesus being real, why not on that?