The mission of prophets is to give spiritual life, not material life. To awaken de dead is to awaiken them to Reality, to God, not to bring them back from death. That would be nothing, because at best it would merely mean that they owuld live a little longer. It is eternal life that is at stake not to exend life on earth. That would be a mission for a physician, which, of course, a prophet ay be, but it is not his or her being a physician that makes him or her a prophet but the fact that they bring spiritual awakening.
Salaam