I believe that people experience possession. Hell! I’ve experienced it. What I don’t believe is their explanation of the experience. I think that it is much more likely to be a product of one’s emotional health or spiritual state than of any external invisible entity.
In my case, I “experienced” the possession of my spirit guide. Since he’s kind of a clunky clay creature in a vaguely manlike shape, moving in a body was pretty novel to him. He didn’t know what to do. I turned over the reigns consciously, so he would get a chance to play. I let myself feel like I was no longer in control, but I know I was.
He controlled my arms and legs very awkwardly, nearly falling over a number of times. I felt kind of like I was a baby learning to walk. When it was time to stop, he left without fuss.
Now what “really” happened? One could tell any story one wants. I’m the only one who experienced and I’m the only one who could experience it, so it’s not a scientifically provable kind of thing. I’m the only source of the evidence. You believe me or you don’t. You believe that I experienced it in my mind, or you can believe that the spirit of a real mudman came into me.
I choose to tell the story I’ve been telling you. It was an experience. I both believed it was happening as it happened and disbelieved it. I wanted it to happen because it meant a lot to me. And really, that’s what is important.
I believe other people experience possessions. I think some of them believe they are actually in the complete control of an external entity. I think the external entity is inside their own minds. I think the possession is a metaphorical way for parts of the mind to communicate with each other.
I believe there is a second mind in our heads that doesn’t have language. So it has a big problem when it wants to convey information to our linguistic minds. One way it can do so is through possession and forcing you to feel things that convey the message it feels a need to convey.
Well, it’s a story. A theory. I don’t know if it will ever be proved that we have a non-linguistic mind that behaves in the way I think it does. Perhaps fMRI will one day allow us to see the brain functioning in a way that could be explained by my theory. I doubt if there will ever be much measurable evidence to support my theory, but maybe I underestimate science. We do say things about the way people think now. There is the “science” of psychology. People respect it and find it useful. Maybe my theory will turn out to be of use. It certainly provides a theory of possession.