Honest speculation: If it were a scientific and historical fact that, every couple hundred of years, a person is resurrected from the dead in the manner Christ was, would anyone at all doubt that Christ rose from the dead (given the historical record)?
I realize that, even if the answer is, "Of course not; everyone would believe he did" (which I believe is the answer), such an argument is hardly dispositive of the issue. For starters, if it were a known occurrence throughout history, the early apostles and Christians wouldn't have been willing to die in defense of their assertion that it happened here . . . and no one would have been trying to kill them over it. But still, it's interesting to consider it.
I came up with that argument, incidentally, on my own, but I gotta believe I internalized it from earlier readings. If anyone knows where I might have read it, please pass it along.