Seth, you have hugely missed the point in terms of limb regeneration. To assert that it could actually happen in nature in the face of a total absence of limb re-growth in any mammal whatsoever is ludicrous. I can confidently assert that there are no mammalian hexapods, because none have ever been observed, despite an intense scrutiny of the world's animals for thousands of years, both by hunters, and scientists of all stripes. With the same degree of confidence, I assert that human limb re-growth is not a phenomenon that occurs in nature; thus making it an excellent candidate for a totally non-ambiguous miracle, whether via prayer or the whim of a putative god. To suggest that perhaps god doesn't like re-growing limbs is absurd special pleading at best.
It is well known that spontaneous recovery from coma or serious neurological conditions occurs, although at a low rate. Some of the recoveries may have been by patients who were prayed over, many would not. The only way to test your hypothesis is not via a single anecdote, but by a double blind experiment. Take 2000 people in comas, divide them randomly into 2 groups, and have one group prayed for, and the other not, with both groups receiving the same medical care. After a year, see if there is a statistically different number of recoveries between the 2 groups.
PS - It would be a bit of a worry if the prayed-for group had significantly fewer recoveries; it would suggest a cranky god who is pissed of at being disturbed by annoying prayers!
