I would prefer to hear from other christians/believers on this matter but obviously I can't control the thread.
One of the things I've experienced almost relentlessly for the last 15 years is the fact that people are empty shells who are very easily possessed by satan. I don't mean in an 'exorcist' projectile vomiting, 180 degree head turning, foul mouthed sense - it's far more likely that there are no signs whatsover, except that there language or behaviour is accusatory or bizarre, and they will often 'tempt', or 'accuse' or harrass me in some way.
A witnessed example in my life would be that I was in a hardware store and another customer at the counter was buying an axe, so he was holding it while standing at the counter, he then went on to hold the axe over my head as though he meant to attack me (this was no joke, people looked shocked and he had a crazy look on his face), and I leaned in as if to make it easier for him and said: "I only fear god" at which point he crumpled and ran. to me this is possession, not insanity. other examples would be like I'm at the post office paying a bill and the staff member becomes extremely obnoxious and bizarre and refuses to do their job. When I return to the same post office another day, the same staff member seems embarrased and apologetic, like they dont' understand their own behaviour on that day and asks me what happened and why.
so...It's been very hard to find any material that substantiates my view that it's an everyday phenomenon, except in vague or metaphorical terms until I stumbled across the following book on the net. It's called The War on Saints. the website is not necessarily stuff I would agree with but they publish the whole book.
http://www.apostasynow.com/wots/Contents.html
any opinions? I believe it's sort of covered in things like the "pilgrims progress" and also in the bible but those are metaphorical rather than realistic pragmatic acceptances of the phenomenon as an everyday thing believers have to deal with.