I'm sure I've also experienced some of these things. But, they are rather crappy attempts to scare us, and nothing that truly poses any harm.
Recently I heard "worship the devil" as I was falling asleep, and when I was new, I'm sure I briefly saw a stereotypical "devil" face in my mind's eye when meditating, with a pointy chin. I also freaked out a bit last time I was close to astral projecting (not due to enemy attacks or anything; I've never done it before), and another time recently when I nearly did it again and I was saying "I'm not scared" that time, I heard male voices laughing mockingly at me.
If you are a former christian, they are most likely using that as a vector to attack and manipulate you. Because the fear of these things is of course programmed by that.
But you know, with time, the less scared you get. If anything, it just becomes an annoyance. Even at my level, as I'm still rather new, I'm not really bothered by it. A lot of them are just thought-forms, and I believe a lot of the time that their behavior is merely programmed. The enemy cannot harm those who are dedicated; they can only try to scare, influence or deceive us into effectively harming ourselves (by impersonating the Gods when we are not yet able to tell the difference), and making bad choices. Father Satan, and the Gods and Demons, would never do such things.
