I was spectator to a healing process of a friend. for almost 2 years, almost every weekend, we went to a few muslim healing center.
the things i've seen, heard, experienced, reaffirmed my believe that there is God, and everything else have to submit whether liking it or not.
the most common creatures we "extracted" out were speaking malay, "orang asli", thai, and even indian language. some, we couldn't even understand. the strongest resistant came from a hindu djin that spoke of retribution from dear leader "dewa murugan" - note the peer relationship. we have rough idea on who sent the creatures. some creatures were newbies, some were on-the-job for far longer than our one lifespan.
these attacks came in continuous cycle. it's like getting fever, getting healed, and immediately you get feverish again. after 2 years, that's why the attacks appear to never stop. that after you go once, twice, you'd think the practitioner healing you is useless. that faith in God, yours and practitiioners' is misplaced and useless to heal your black magic woes. because ultimately that is what these dark creatures aim for - to lead you astray, so that you find other alternatives than the God you believes in.
more than that, these healing practitioners wants you to believe that humans are better creatures, and if you are strong in your faith, they cannot harm you and you can repel attacks on your own will. the practitioners didn't ask to join them, but you have to find your own strength to repel them.
and that is what my friend learnt. to get stronger in believe, in faith. we stopped visiting the healers not because their appearing ineffective, but because my friend now can repel waves of new "hire" sent to kacau on his own. he can even detect their presence unlike before. the attacks are now further apart in their timely repetition.
You do know that you don't have to be a Muslim to able to heal and fend off attacks, right?
Also, i have met quite a number of djinns, yet none of them showed hostility to my beliefs. In fact, i consider their presence pleasant.
Besides, your friend learnt that, but you didn't.
So technically he should be the one trying to lecture us.