Amen: Reason i asked if he was a christian was because there are two types of evil spirits, ones that can possess the non believer, and some who torment the believer...Paul could cast out demons, but one time he was under attack by a messenger of Satan, and could not cast this out, of get rid of it.
2Co 12:7 And lest I should be exalted above measure through the abundance of the revelations, there was given to me a thorn in the flesh, the messenger of Satan to buffet me, lest I should be exalted above measure.
2Co 12:8 For this thing I besought the Lord thrice, that it might depart from me.
2Co 12:9 And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me.
2Co 12:10 Therefore I take pleasure in infirmities, in reproaches, in necessities, in persecutions, in distresses for Christ's sake: for when I am weak, then am I strong.
This is rare... but can happen to saints who may be recieving revelations from God. Just thought id clear that up...and if a person is getting marks on his body as some have said, this type needs to be cast out...but may require fasting and prayer.
God bless: will keep praying for your friend