Well, I certainly respect your right to believe what you wish.
I'm not so sure that coming back to life as described in the bible for Jesus will always be beyond our capabilities, with the increases in nanotechnology and genetic manipulation that we can expect. (Although it was certainly beyond the capacity of first century Roman civilization, and beyond our current capacity as well, concededly.) So I would not say that coming back to life, per se, is scientifically impossible.
But, nevertheless, even if it were, for this story to act as the kind of natural evidence of the existence of a God, it would have to be verifiable, which returns us to my original question about non-documentary proofs. To credit this story as evidence for the existence of the divine, it would seem to me, requires proof that this man actually lived, that he actually died, and that he actually rose from the dead. Again, I don't believe that there's any evidence whatsoever, aside from the bible, from which these points can be substantiated.
Thanks for your reply. It was thought provoking.