Actually, it is not up to anyone to prove to you that it is real. There is ample evidence that it is not been proven to be a fake and no evidence that it is. There is significant evidence to make a strong case that it is a first century burial cloth. As for miracles, we need only concentrate here on the formation of the images. Much work is being done to show that they might be the result of a perfectly natural phenomenon. Of course, if they are miraculously induced images it is unlikely that science could prove that.
Hell, for all we know, the shroud could well be 1st century... taken from a burial, sold to an artist, who then painted on it. Given that there is no blood on the shroud but there is iron oxide and other pigments...
Good stretch in thinking. (Oh, did you miss the point about their being blood and no concentrations of pigments or iron oxide to form an image). Now for that to be so we must assume that the cloth was separated from the body it contained. We must, of course, consider Jewish attitudes regarding blood. Now you might develop your theory a bit more to think that Romans unwrapped the body or maybe they had some of their Syrian slaves do it.
Occam's Razor you say. Are you for real?
theortical Jesus ??? I guess if you put no stock in history you probably put no stock in science either. Maybe this explains where you are coming from.