@niky,
Historians don't deny that Christ lived on earth. Jesus' disciples wrote of personal accounts of the events of Christ without contradiction. I'm not quite sure what else Christ could have done to prove his divine origins. He healed the sick, raised the dead, raised himself from the dead, predicted future events that happened as He said it would, and ascended into heaven, and all this in public places with crowds of people. Science can't explain all these miracles but science doesn't have to explain it.
Man, I miss a lot when my DSL goes on the fritz...
I'm not debating the bible, per se. But I'm pointing out that it isn't the most self-consistent of documents. Yes, there is some historical evidence to suggest the existence of a Jesus Christ and of the Apostles, but this is the "Creation versus Evolution" thread.
We don't have historical evidence for some of the things the Bible claims happened before Christ. We're fairly sure there was a David, a Solomon, a Moses... we're fairly sure that the Jews did escape from Egypt, did conquer the Palestinians, etcetera... we're not certain there ever was a "Noah" (the flood myth is common to many of the local religions and cultures, only with a different name for the ancient mariner who survived the flood...)
And we have no historical evidence for an Adam or an Eve... and the Bible never tells us where Cain got his wife (ripped out his own rib, perhaps?).
My point is: just because some parts of the Bible are possibly true, does not mean every single word is.
But the Churches don't want to admit that... and much blood has been spilled in arguments over the finer points.
I would hazard to guess that if He healed someone right in front of you that you still wouldn't see the miracle. You are entitled to your skepticism.
I would try to ascertain that the person was indeed sick, and that healing had, in fact, occurred. I would establish repeatability and verifiability.
I've seen lots of "healing" in person... people speaking in tounges, "possessions" that looked like nothing more than hysterical/epileptic attacks... laying of hands... and the charlatans who pronounced themselves healers on TV in the 80's.
Unless you can verify it, or it has been verified scientifically following proper procedure by an independent observer, of course you've got to be skeptical. That's the scientific way.