I believe that it is possible for us to live again after we die.This has nothing to do with relgion it just seams to make sense to me , although it doesn't mean that we will, only that it is possible.
This is based on the following reasoning .If our conciousness us just a function of our brain,and our brain is just a pattern of atoms, then all that needs to happen is a recreation of this pattern.
Computers are getting more powerful, maybe sometime in the future we could map an entire brain and recreate it in a test tube.Maybe the DNA of dead people could be used to recreate them. Since the specific birth of yourself happened and your particular brain was "created" there is no reason it can not happen again with the right conditions, even naturaly.
If the brain is more than just what we think it is, and has an existance like a soul or is an effect like gravity caused by the physical makeup of the brian interacting with something else , then it should still be possible to live again if the brain is recreated.
Whether this will ever happen I dont know.