why ghosts don't exist

Here is the arguement for the non-existence of ghosts that I posited to my 4 year old who is currently enchanted with the game "Ghost in the Graveyard."
1. When the body dies, a person's soul goes to live with "God", who exists in another dimension -- can you say DIMENSION?
2. Therefore there is nothing left here on earth to be a ghost.
3. So ghosts are made up because it's fun to feel spooky sometimes.