Well, this is where we disagree.(Yes I finally registered so this is my username now) I believe there is evidence that God has restored life. Now whether you believe that evidence amounts to conclusive proof is another matter entirely. That evidence is the resurrection of Jesus Christ.There is absolutely no evidence to suggest that those omnipotent God can in fact restore life. We certainly DO know that he is unable to restore limbs as there has NEVER been an instance where he has done such.
If the gospels of Matthew, Mark, Luke, & John are true eyewitness reports (as I believe they are) then yes God has restored limbs when Jesus cured lepers. Leprosy is a very nasty disease that causes people to lose limbs. And if there is going to be a world-wide resurrection of the dead at Christ's second coming, then we can expect that we will be given new bodies that are superior to what we possess now.
Yes people should be skeptical. But not all things are made up. In truth, Christians are called to be open minded (even if fundamentalists don't believe it). Open minded does not mean being gullible. It means considering both natural and supernatural processes. We should consider natural processes up to the point where natural processes cannot sufficiently account for a majority of the data. At that point we are to begin looking to see if there is a supernatural explanation, but without forcing it to fit our beliefs.People make up all sorts of beliefs, but one should be extremely skeptical when things are made up with absolutely no supportive evidence.