Please allow me to list all of my beliefs about the "supernatural."
Ghosts: As in ghosts of dead humans come back to "visit" us, no. Demons: Yes, but I have a specific definition for them. I believe that there are angels that were thrown out of Heaven at the Fall of Man that are called demons, and I do believe that they will show themselves to us and interfere with our lives. Also, I believe they will take the form of the dead as ghosts.
You can believe in demon stuff but not ghost? I do think that weird stuff does happen a a lot and ghost are real but i guess you can't make someone believe in ghost unless they see it themselves.