I don't believe that they exist in the way people believe. I believe there are some angry and mean earthbound spirits, but not whatever the heck demons are supposed to be.
Considering that human beings can create things such as hate, anger, fear, and meaness; one doesn't need to look for spirits with non-human origins to find a spirit with a nasty vibe. Regarding the creep imagery, they can get that by watching horror movies. I've heard that blue scars are more evil than red scars (sarcasm).
Psychologists reported that after the Exorcist came out the number of people who believed they were possessed increased significantly. Congregations that are led by preachers who teach about demons etc. tend to have many more supposedly possessed congregation members than congregregations that aren't led by such preachers.
When a person goes through the kundalini unfoldment process, suppressed subconscious thought patterns eventually find there way to the surface and a person has to deal with demons that his or her own mind created. This is what I found. If you check out the attached thread you'll find that I'm not alone.
http://www.kundalini-support.com/forum/index.php?topic=9695.15One time I had an out of body experience where I travelled to the entrance way of a dark realm. I automatically/intuitively knew that the spirits within could only get out when they asked for help and a light being or light beings came to help them. Something such as ouija board usage might be an exception to this. When this experience ended the thought immediately occurred to me that ouija boards might provide an exception.
Before I went to sleep last night I asked to be provided with a dream that explained the manner in which confused spirits exist. One dream showed me that negative minded spirits are powerless to do anything to spirits who live according to love and light. One showed me that people who have an addiction sometimes become earthbound with they die and attach themselves to physical people who have the same addiction. One dream told me that sometimes spirits become earthbound because they are attached to the physical for sentimental reasons (e.g., they are attached to the house they used to live in). I was not provided with a dream which stated that there is a such thing as armies of darkness, even though I asked to be provided with this information if this is the case. One time I was shown a vision which showed that sometimes earthbound spirits with a similar energy group together. But, this is quite a different thing than an army of darkness. My feeling is that self centered, angry, hateful spirits couldn't get along well enough to set up a large organization. They'd be too busy fighting each other to ever get anything done.
Think of people who do have problems with negative minded spirits. When they get help from other people, the negative minded spirit doesn't have reinforcements come and take care of the helpers.
Rudolph Steiner is an example of a new age like guy who pushed the demon viewpoint. He spoke of Lucifer and Ahriman. Supposedly they lure people to a paradise like realm when they die, so they won't try to spiritually progress. Gee whiz, you would think that light beings who represent the truth and are affiliated with a crossing over spirit would be there when a person dies so they won't be influenced and misled by the sort of beings Rudolph Steiner speaks of. After all, love based spirit beings certainly understand that we get confused while we're down here with the numerous belief systems that are available, and know that we'll need their help. They'll let us know what it's really about when we cross over.
Rudolph Steiner was also a man who had racist ideas such as black people have dark skin because they didn't develop their id. Indian people have red skin because they have super egos. I always thought environment had something to do with it. For example, native Americans from South American countries, black people from Africa, Brown people from India, and brown people from Australia (Aborigines) have dark skin because they live in hot environments. People from cooler climates such as Norway, Finland and Ireland have light skin because they don't live in hot environments. If you go by what Rudolph Steiner contends, people with darker skin aren't as spiritually evolved as white people. He also said: "It isn't because of the whims of the Europeans that the Indian population has died out, but because the Indian population had to acquire those forces that led it to die out." Here's another statement he made. "A soul can be incarnated in any race. but if this soul doesn't become evil, it doesn't need to be reincarnated in a descending race, it will reincarnate later in a ascending race."
http://www.skepticreport.com/mystics/steiner.htm