This is a question for unbelievers, of course. Christians know that there is no such thing as a ghost. In fact “No evidence has produced a single fact that should sway a Christian into believing that the spirits of deceased people can loiter on earth,” wrote Rick Barry in 2010 for Answers in Genesis Magazine.
According to Christian apologist Ron Rhodes who penned The Truth Behind Ghosts, Mediums, and Psychic Phenomena:
A common misconception is that disembodied spirits can remain on earth or perhaps come back to “haunt” or otherwise interact with us. However, nothing in the Bible supports this belief. Rather, “man is destined to die once, and after that to face judgment” (Hebrews 9:27)
Dabbling in spirit contact is strictly forbidden in the Bible. We must come to grips with the fact that demons can masquerade as the dead and can mimic the voices of our loved ones. Moreover, demons can give information that only the dead person would have known. For this reason believers must never attempt to contact the spirit world.
So – now to the article Rick Barry wrote for AIG:
Ghosts. What do you really think about them? If someone pushes us, most will admit a degree of love for scary stories. But what about reports of real ghosts, even by sincere Christians? Few Christians seem to know what to think. If we look to the Scriptures, however, we find solid answers, even on this murky subject.
Both children and adults alike wonder about the existence of ghosts. Some reject the notion. Others insist that ghosts exist and cite experiences—their own or friend-of-a-friend stories—as proof.
But what is a ghost? Although definitions vary, the most common one is that ghosts are the disembodied spirits of dead people that linger on earth. According to tradition, ghosts are invisible but can permit humans to see them.
Of course, either a thing exists or it doesn’t. No amount of belief will cause ghosts to exist if they don’t; nor could personal opinion cause ghosts not to exist if, in fact, they truly do exist. Because a person’s belief in ghosts creates very serious and far-reaching ramifications, it’s a topic that no Christian should ignore.