cryogenics is basically the key to immortality...
look at how much technology has evolved in 100 years, or 1000
in a few million years, immortality will probably be discovered, and people will find a way to revive those who were cryogenically frozen and make them immortal

when that happens, the answers to all religions will be revealed, because people will be able to come back from death and tell if they went to heaven or hell or something completely different...

thoughts?