When looking into occult related things, its important to know that their understanding of their own experiences is extremely incorrect. However they probably have some information that might be accurate
The thing is, many occultists and such say that when your dreaming, your really on the astral plane, just not concious. That fits in with lucid dreaming leading to astral projection because if your already on the astral plane, then becoming concious would be the only barrier to being astrally projected
I dont believe astral projection is sinful or anything, but that you should avoid contact with other beings (humans, demons, angels) on the "astral plane" as they lable it because it could very well be a demon impersonation. The only way to know they werent a demon is to do what the bible says, to test them. Ask them to confess with their mouth that Jesus is Gods son and the risen saviour. I dont believe that they can harm you, maybe they could, but many accounts of being attacked by demons is just a bunch of voices and such. God talks about a sliver cord being cut when we die and many occultists say that they see a silver cord when their projecting.
To that affect, its still very possible that the whole thing could be a demonic deception because i still havent gotten control of my dream or astrally projected. What really sparked my interest in astral projection was one day i was sitting in my bed, id woken up and hour earlier and had gotten up and gone back to sleep. I started feeling numb and was like floating and just felt really awesomely weird. I cant explain it but at first i thought it was a vision from God, until i saw this big blue thing that looked kinda like a unit from warcraft. Then i was hovering above my school bleachers and their was a projector shooting at the wall behind me. it was like somone cut a area of my gym out, put a wall around it, a door and a projector in there. I floated on down past the projector and then i was in this room. I think that my brain made up the room later because all i really saw was a big pink/orage/yellow box(it was that thing that God was in, like the special box that people died when they looked in, and i didnt know the name of it but i just knew what it was, i still dont know its name), which i floated by and the turned and looked at 2 tables that were from my school and a pillar. On one of the tables was 2 of my kneadable(they can be bent like clay) erasers, with vitamin A and vitamin B (ive been taking calcium and vitamin c for a while and i think i got those mixed up) And on the other table was a piece of paper and something else i floated/moved (i wasnt really a body, i keep thinking i was a blob of light but i dont remember that either) over to the paper, and i read at the top "new text document" then it ended before i could read the paper.
I believe that i had started to astrally project when i fell asleep and was only partly concious so my subconcious started dreaming but i was really excited and freaked out so i was called bak to my body, later when ive tried to astrally project(i usually fall asleep and wake up three hours later) once i felt this strange warmth on my cheek, another time i heard this loud blazing wind for one second and once i was like seeing really far away but up close at the same time and their was like a planet, but it wasnt like i was seeing with my eyes it was just i was seeing. If astral projection is a demonic deception, i dont think ive done anything to get possessed at all, when i try to astrally project, i just realx and try to clear my mind alot then make myself feel like im falling, (visualization), and either visualize myself lifting out of my body, or make my hands feel like their climbing a rope straight out of my body. God doesnt speak against any of those things.
If astral projections not a demonic deception or if it is, i dont think lucid dreaming is dangerous either way, but that if astral projection is a demonic deception, you shouldnt be able to do it from lucid dreams. But ive never done either, yet recently when ive been trying to lucid dream ive remembered my dreams almost every night that ive been trying to lucid dream.