There is much theological debate whether these entities are ghosts or demonic/familiar spirits or something "else"...I believe it's difficult to get a clear grasp when trying to differentiate between them from a biblical perspective...
...trying to find an english word from a greek book doesn't come without its challenges.
But I have no question in my mind that these things exists. Events and occurrences that surpass a wordly/logical explanation. I have heard countless stories from credible people.
The folks that have never borne witness to them (including myself) have to go by what someone has told them. So there is sometimes a "faith" component to acknowledging their existence.
But the way I see it, if you believe that Jesus is who he says he is, NOTHING should surprise you when it comes to this type of stuff.
