My take on this is that people in general (regardless of religion) just go and associate ghosts to the paranormal, and consider the paranormal to be
something that only weirdos believe in, and some even calling it the work of the devil! I've encountered a few situations where, in hindsight after
deconverting out of Christianity, I have seen this to be true.
Oh, I may stereotype all Christians with some of what I say. That is not my intent. I know there are Christians around who are not quick to stereotype
all paranormal activity as something for kooks to believe in.
This is sort of a reverse example of how the paranormal is associated to bad/evil behavior. A few months ago my wife's friend, with whom she lived
before my wife and I married. This friend married a few months prior to our wedding. So, this friend and her husband had been having ongoing problems
which involved him being extremely controlling and having some mental issues come out in forms of verbal abuse, among other things. One day all of it
came to a head and she ended up leaving him. When my wife told me about what happened and the conversation she'd had with another friend (a pastor
and his wife, whom she has been close to for like 20 years), they got to thinking that this guy is/was demon possessed. I personally think that the
guy just has some mental problems, and my wife has even told me that he does struggle with things like schizophrenia, ADD, and slight
obsessive-compulsive problems. How can they just connect that with demon possession?
Another time my wife and I were having lunch with the pastor I mentioned, and his wife, and somehow the topic of telekinesis came up. He told us that
he had actually witnessed someone moving things with their mind. I was actually quite fascinated by this even though it was prior to my deconversion,
and I asked him what he thought was going on when he saw the telekinesis at work. He quickly said that it was obviously Satan at work.
I could mention other examples, but all paranormal activity can be put into two categories for most (not all!) Christians. If it's good and
beneficial to Christians, then it is the work of God. If it's bad and comes across as evil, then it's clearly Satan trying to cause doubt and/or
harm to a Christian.
So, to get to the matter of ghosts and poltergeists and hauntings, I think that most (not all!) Christians see them as the evil things I mentioned.
Seeing ghosts shouldn't be possible if the belief that a saved person dying goes to heaven is true. Perhaps they'd feel that the ghost is the spirit
of a non-believer, but then shouldn't they be in hell? Or perhaps it's just an illusion being used by Satan to pull believers away from their
beliefs.