this is a dumb question, what soggy said you cant even measure this
you can even say christians believe in spirits 'the holy trinity-holy spirit'
and christians are all over the place.[/quote]
Christians don't count the Holy Spirit as a real ghost. Some Christians believe in ghosts, some don't, and some are agnostic in this regard. There's really nothing totally definitive in the Bible in this regard, which is why people are so split over it.
This is complicated because on one hand, Western culture has lots of those ghost shows, ghost stories, horror movies, and Halloween.
But in Eastern cultures they have lots of religions which do certain things to prevent the ghost from coming back, and the culture is a lot older so they believe in stuff that was also believed in a long time ago by people who were less skeptical about ghosts.