score:2
For Christian Mortalists, the human soul and/or spirit is mortal and dies at physical death. The soul and/or spirit is not independent of the body like on Platonic conceptions of the soul.
For advocates of Soul Sleep in particular (where the soul and/or spirit is alive but in an unconscious state), it's just the way God made humans as opposed to other incorporeal creatures. There isn't anything logically impossible with human souls and/or spirits being conscious apart from the body, but that isn't how God created human souls and/or spirits. Though God is spirit, it doesn't mean all spirits share in the eternal, uncreated spirit of God. Their spirits are created and qualitatively different from God's. Those of angels and demons are conscious when incorporeal, those of humans are unconscious when incorporeal.
Upvote:1
Jehovahβs Witnesses are sometimes categorized as soul sleep adherents.
We teach that the death of a human ends all consciousness. Thus the condition of the dead is likened to a deep sleep.
Whereas the human soul is the living person himself, the spirit is simply the life force that enables that person to be alive. The spirit has no personality, nor can it do the things a person can do. It cannot think, speak, hear, see or feel. In that respect, it might be likened to the electric current of a carβs battery. That current can ignite the fuel to make the engine produce power, cause the headlights to shine, sound the horn, or cause the carβs radio to produce voices and music. But, without the engine, headlights, horn or radio, could that battery current do any of these things by itself? No, for it is merely the force that enables the equipment to perform and do such things. This spirit or life force is found in all living creatures, being passed on from parents to offspring at the time of conception. Source
Since we teach that no continuation of life is possible for some unseen part of humans after death it is unthinkable that any spirits mentioned in the Bible are formerly living breathing humans.
Instead spirits in the context to which your question refers are created non physical creatures. Angels are spirits. The angels that rebelled along with Satan are often referred to as demons. These unclean spirits were never human. They had no physical properties assigned to them when they were created.
Bible accounts of angels materializing and interacting with humans are true. But these manifestations were not humans.
The only conscious spirit creatures are those ones who were created spirits.