Anyway a big error is thinking there is something wrong with the person because they had or have spiritual problems. No!, they take advantage of the silliest of things, or just bully their way in sometimes when people are not believers.
And i don't know why people are obsessed with the word posession, most of the time is not something dramatic like that, instead the evil spirits just stay there, lying, tormenting, hooking you up to sin, deceiving, not letting you believe etc.
A lot of 'OCD' seem to be from evil spirits for example, yes even in christians.
I had intrusive thoughts, they went away with deliverance 'detecting' a spirit and driving it away.