People commonly claim that their god helped them by healing their cancer or alcoholism, along with those numerous times when some god helped a sports team win or helped someone find their car keys. But plenty of people without those gods have had similar outcomes when confronted with similar problems. Hence there is no clear indication that a god was involved.
Amputation, on the other hand, are indisputable. A missing limb is a missing limb, and though science and engineering can currently do marvelous things to help replace the missing limb with new technologies, it is certainly not the same thing as having a person regenerate and use a missing limb. Right now there is no known mechanism in humans that would allow such a thing. Hence, if religious people, and only religious people, started growing limbs back and regrowth was documented and verified, there would be no disputing something that is far beyond our understanding was happening. And if these religious people got their limbs back after praying for such results, and nobody else had the same experience, the god concept might start looking a bit more valid.
Hasn't happened, won't happen, can't happen. We're just playing with your minds. We will drop the whole discussion when believers stop with the nonsense and realize that their religion is a fantasy. In the meantime, we're trying to get your attention so that we can show you the error of your ways.