Apparitions of the dead are not necessarily demonic. There are numerous instances in the loves of the saints where the living come into contact with the dead outside of an act of 'necromancy.' I have dealt with several of these situations, and I know other clergy who have as well.
Am I glad to hear this! Since right before my mom died (this May) until about a month ago, I was having some very strange, inexplicable experiences, which occurred at very peculiar times (e.g. a family picture falling off the dresser while my dad and I disagreed about inheritance money, a baby carousel that my mom gave our son starting up on its own while my wife and I were arguing, and again at other times when I really needed a sign that my mom still existed in some manner, an untouched, closed book my mom recorded in her voice for my son reading a page out loud while I changed my son's diaper nearby, a door handle moving back and forth a few times on its own while I was going through a day of terrible nihilism, a huge tree branch next door breaking and falling on a calm day while I sang and played a song I wrote about my mom on guitar, strong wafts of cigarette smoke odour around our baby while inside - my mom was a heavy smoker, and no one in my house smokes - my cell phone going all glitchy - it was shutting off whenever I tried to text and re-receiving old texts but dated from 1980! - for about five days before my mom died, and then going completely back to normal working condition an hour before my mother was declared dead).
I didn't believe in these kinds of things at all, really, until they started happening to me. Some of them could have happened due to natural forces, I suppose (except the door handle. I investigated... no reasonable explanation), but I don't think they all were. Most of the times these things happened, I was filled with faith and hope, not dread, and they drew me closer to God, so I simply do not accept that these occurrences were demonic. And I assure you I am not crazy. Well, not really.
I am in fact too
skeptical sometimes, I'd say. My wife has also been present for most of these strange events.