" GHOST"

I'm not quite sure how to explain my various experiences, except that all of them were accompanied by a strange evil feeling. My earliest was when I was very young. I was younger than most people were when they start remembering things, which puts it when I was probably younger than 2.
Anyway, the memory is of a hideous spider, much larger than normal spiders found around the typical American house. This spider, on several nonconsecutive nights, would descend from the curtains in the living room and talk to me. The first night it visited, it told me not to be afraid, that it was my friend. It talked to me about various things such as the toys in my playpen. Then it climbed back up the window and was gone.
Several nights later it returned, this time looking a little bit different, bigger and less friendly. This was around the time when my parents began going to church and, according to my parents, had become Christians. It told me that it didn't like when my parents sang to Jesus. Then it went away again.
The next time it came, it was monstrous in size, with dim red eyes and long, scary legs, like those of a garden spider, chitinous and smooth. It told me it wasn't going to be my friend anymore. Then it left, and I never saw it again.
I am now 16 years old. To this day I am scared to death of spiders, especially larger ones, and they seem to know it. Spiders plague my room and, it seems, deliberately go there just to torment me. Just the past year I have had several nightmares involving spiders and sometimes wake up to find medium to large size spiders in my room, like I can sense them somehow, usually on the ceiling, trying to drop down on me or something. This may sound paranoid but it's true. They scare the piss out of me.
The other major incidents involve my old school, which is also a church. It was a private school, with a low student count, about 50 or so. It is located in a buidling that used to be owned by the Free-Masons or some other religious sect. In the upstairs floor, when the church first bought the building, a giant pentagram was cut into the floor, for satanic rituals, I assume. It also had some other things that hinted at rituals being carried out.
Anyway, some of the freakiest things happened to me and my friends there, most of them at night (of course) after a youth group or Bible study (which I didn't attend, I just went with my mom).
The weirdest occurence happened upon our return from a trip to the Jersey shore. Some of the private school's students went, about 30 people in all, counting chaperones. When we arrived, it was (I assume) 1:30 to 2:00 a.m. and, rather than drive each person home individually, we all slept upstairs in the church, in the room where the pentagram once was (they cut it out of the floor and replaced it with normal floorboards) and awaited each kid's parents to retrieve them the next morning. I remember hesitating to sleep in there, but I was so freaking tired that I just didn't care. The next thing I remember was hearing a hellish scream. I suppose only I heard it, because only I woke up.
Now this sounds quite strange, and I'm not sure if I just dreamed it or if I really saw it, but it scared the hell out of me. If it was a dream, it was the most vivid I had ever had. The room was full of smoke, with flickering red light, and weird creatures standing around the spot where the pentagram wasn't supposed to be, but was. The pentagram emitted an evil red light, like it was a gateway to hell, and was made of human flesh, bleeding and sweating. The creatures all turned to a monstrous shadow in the smoke and began speaking strange incantations in low, evil voices. The enormous creature shrouded in smoke promptly strode into the middle of the pentagram, looked at me with huge red eyes, and roared the most inhuman sound you could imagine. It's body was massive, with horns sticking out of it's back, sides, and head. It's jaws were huge, and, when opened, revealed large, sharp teeth. It began to reach for me with arms that were much too long for it's body size. Everything vanished, and I either awoke from the dream or came out of the hallucination, I don't know which. I screamed, and, seeing where I was, screamed again, for I was not where I had gone to sleep, but standing in the exact spot where the pentagram once was. My screaming woke everyone else, and one of the chaperones came running to see what I was bellowing about. I guess I was about 11 or 12 at the time, and no time before or since that happened do I remember feeling such stark terror as when I gazed into the gaping jaws and glowing eyes of that demon.
I will never sleep in that place again. If the mere act of falling asleep in a place once roamed by demons and used for satanic rituals can cause someone to dream or have a vision of something as horrible as what I saw that night, then who knows what else might happen, possession or God knows what else. All the other experiences in that place were of the usual sort, lights going on and off, strange noises, feeling a presence and finding noone there, doors moving by themselves, etc.