Has anyone on this discussion board ever felt the holy spirit?
Yeah, me.
I also once had a roommate in the military (gay, interestingly enough) who at least feigned demon possession pretty well. Due to a very stupid mistake by a military doctor, he on convalescent leave and taking pain pills daily (codeine).
One day I came home and he had cut himself and used the blood to make an upside down cross on the message board on our door. The room had a strong odor that he described as dead animals, and that is what it smelled like.
For a couple days he screamed if I touched him, and since I was a new, zealous, somewhat-Kenneth-Hagin/Copeland-style Christian () at the time, I tried to cast the demon out of him. (This was 1984.) It didn't work, so I read the Bible to him, figuring I'd torment him rather than him torment me. He screamed and fussed, scratched at his eyes, complained about the lights, threw things at me, threatened to kill me in my sleep, etc.
I had the distinct feeling he was faking it, although I couldn't explain the smell, which lingered the whole two days he did this. Then he just quit, saying that he had snapped out of a daze and couldn't remember the last two days. He claimed it started when he saw red eyes above the refrigerator as he came home, and that it was a demon sent by a group he had been part of that sacrificed animals.
As an aside, I lived in Europe for six years from 84 to 90, and I had a couple African friends and a couple friends from Surinam. It did seem pretty universal that people from those countries have some amazing stories about zombies, "demons" in church services, and some unusual feats that these demon-possessed people did.
I also read a Newsweek or Times article back in the early 80's about a Haiti ceremony that was amazingly positive. The journalist actually participated, including licking a poisonous frog (if I remember correctly), and got caught up in the whole ceremony. If demons don't exist, there are certainly experiences that people have that are right along the lines of what is described as demonic in the Scriptures.