I believe that this life in which we find ourselves is merely one stage of our existence, a preparation perhaps for what is to follow. I think that once we leave our physical bodies behind, we evolve into a higher state of consciousness, life forms of pure energy and thought patterns. Much of my belief system stems from the theories of Karl Gustav Jung, the collective unconsciousness, etc.
I definitely don't believe in the somewhat simplistic vision of heaven and hell as represented in theological works of literature, life and how we live it is not so easily classified into neat little boxes of "good guy", "bad guy" etc. In practical experience of everyday life, there are way too many grey areas for tidy taxonomic classification.
(Been watching too much sci-fi again, no apologies!)