Well. I believe it's totally possible to animate the body to an extent after death. But the totality of the individual, the consciousness, is gone. No going back; Either it merges back with the Universe, or goes to heaven, or fades away to nothing. Whatever you believe, it's gone. As someone famous (Lavoisier) said though: "Nothing is lost, nothing is created, everything is transformed." I guess the "fades away to nothing" is the only impossible option;