[MadPoet]

There has to be a place after death. I can't imagine just nothingness. Personally I believe that the ghosts are people stuck on earth who are in the process of crossing over. I think that they're either on earth because they haven't found "the light" yet, or because they have unfinished business and need to prove they are worthy to get to Heaven still.

I believe in demons too, but not in the devil. I think that demons are the really evil people, and that they're stuck on earth too but in a different "realm" than the ghosts. They either have failed at their second chance, or they weren't worthy enough for one and will perish when the world ends, if it ever does.

I believe ghosts can interact with some things, and can be seen, but not demons. Demons, like I said before, are in a different realm and can't interact with the world, although they are technically on the earth.