Even if there were contemporary documents demonstrating his existence, they wouldn't be proof of his divinity. (Frankly, even if such documents existed, detractors would question their authenticity as blindly as supporters would proclaim their authenticity).
Even if one could go back in a time machine and watch him heal someone, it would be met with the same skepticism as one of those TV preacher/healer/evangelist guys receives.("It's the placebo effect...the human mind is a powerful thing..." A witness to the resurrection would likely argue that he wasn't really dead when they took him down off the cross, or chalk it up to an unexplained phenomena.
Those who are going to believe are going to believe. Those who are determined not to believe are not going to, save a personal religious experience, like Paul. Look at how many people don't believe that the Holocaust really happened, despite eyewitness accounts, written records, and photographic records. Skepticism isn't anything special. It's merely the flip side of blind faith.
Mossman
Wielder of the Fungus of Death
Offical Stalker of Spettio
Green Gaidin Approved.
"Never attribute to malice that which can be adequately explained by stupidity."