Just what ssandra said.. but I'll elaborate more..
why does reading the scriptures of the bible hurt the demon?
It's a "permission slip" to pull him/it/us/whatever out.. as ssandra mentioned it could be anything..
it's the idea of saying.. I gave you permission and through the help of this co-creation I give you permission no longer
And why does an exorcism work?
Because this is a experienced based reality.. and some of us or all of us our here to experience limitation/physical.. hence anything we can imagine we can do.. does that help?
Also see above same answer
Are exorcisms limited to a christian practice?
Does your imagination say so?? absolutely
not.. try watching "exorcist 2".. I believe they talked about.. exorcism's in Africa or something.. can't exactly remember been a while..
Why does a demon want to posess?
Who can say?? you'd have to be the demon and technically you are..
just assume that if you want to be possessed or have a experience where you are not in control or partial.. they'll help you out.. in whatever form they are.. understand that there is already positive beings possessing humans it's just cause there positive.. we give them permission ehh??
But even when it's negative.. it's still permission based on some level or allowed by default.