Ancient-Origins.net on Ghosts
My Answer: The Bible says do not contact spirits because they are the spirits of Demons who serve Satan. This is Pagan worship called witchcraft. Secular sciences are atheists and do not believe in the supernatural, so they say these are hallucinations by suggestion, or caused by altered states from drugs hypnosis etc.
The truth is all three explanations are partially correct. If you believe something you are likely to jump to conclusions and interpret every tiny thing as a ghost, etc. like most of the ghost television programs who try to make you believe it it all a hoax. However, some are real, but they are not ghosts The Bible says no one returns after death, they go to Heaven waiting for their celestial bodies after the Rapture occurs on earth, or Hades to wait for judgement.
The real appearances of evil spirits is caused by electromagnetic fields produced by the earth at certain times mainly at solstices and equinoxes, along lay lines at Megalithic sites built by the Phoenicians and Naphilim giants all over the earth. This electric/magnetic field is used by invisible entities to materialize as electromagnetic holograms as dead people, aliens, faeries, gnomes, and UFOs. Sometimes they can use transmogrification to create solid objects out of this energy. Peyote and other drugs, hypnosis, and sex brings on altered states which open the mind to contact with Demonic Guide Spirits. These communicate by telepathy which can also produce hallucinations. Or they can levitate objects. And produce other paranormal phenomenon.
We are living in the last days before Jesus return, so Satan and his Fallen Angels, assisted by Demonic spirits, hybrid humans known as Nephilim, and chimera genetically altered organisms made of genes from humans and animals creating monsters. This is in preparation for the contact with aliens from space hoax that will be used to cover Satan's Invasion during the 7 year Tribulation period.