Religion and mental illness
Mental illness has nothing to do with religion or non-religion. It may happen to anyone with any doctrine: atheism, idolatry and any of various religions.
But we sometimes say words like parables about some bad behaviours of some people, and we say: that person is really mad or lunatic or crazy ...etc.
>> There is a prophetic tradition: "The mad or the mentally-ill in fact is the disbeliever."
People said: "How is that?"
The prophet said: "That is because the "mentally-ill" man is only a diseased or ill person; while the disbeliever sees the truth of God and the afterlife Paradise and Hell, and yet he chooses Hell rather than Paradise."
>> The other point is that Satan has control over the associater and the idolater and the atheist, and will control his behavior and thinking almost completely: therefore most of "the possessed" you find them of those associating others (like idols, Jesus and imams) with God.
Example: Once, I saw an old woman taking her son to the hospital for the mentally ill patients;
I asked her: "What's the matter with your son? [I saw him a young man: with a large rosary in his hand, and some large green piece of cloth around his neck]"
She said: "He is with the darawish: who do their ceremonies of the zikr"
I said: "Your son is only possessed by Satan and the genies: they had control over the enthusiastic and the associater."
Then I said to the young man: "What's this green band around your neck?"
His mother said: "It is from the shrine of imam Kazim at Baghdad."
I said to him: "Throw away this band: which is some sort of associating Kazim with God; and know as it is in the Quran that God is the Patron who protects people, not Kazim and other righteous people."
The young man threw that band away, and took his rosary to throw it also.
I said to him: "The one to whom you should resort for protection is God alone: not Kazim, Jesus or Moses; because these are only some righteous servants of God: the best one among them is the one showing much servitude and obedience to God, and God is the True Patron."
And I advised him to read daily the soora of protection from Satan (soora #114)and from the evil of other creatures: (soora #113)
Then I told him to leave his friends because they may return him to their confusion.
The man responded and his mother was very glad.
>> Therefore, we have to differentiate between the false religions of polytheism and enthusiasm and association with God on one hand; and on the other hand the religion of God: which is the pure monotheism and devotion to God alone.
>> Another point is that the easiest way of Satan and disbelievers to oppose the apostle is to accuse him with the mental illness; this is in the Quran 51: 52-53
كَذَلِكَ مَا أَتَى الَّذِينَمِن قَبْلِهِم مِّن رَّسُولٍ إِلَّا قَالُوا سَاحِرٌ أَوْ مَجْنُونٌ
The explanation:
(Even so: not a messenger came to those [peoples] before [your people, O Mohammed], but they said: "A sorcerer, or mad.')
It means: Every nation of the ancient said about their apostle: he is a magician or mad and possessed; so that others might not accept his teachings; because people do not trust and do not follow the words of the mentally ill.
http://www.quran-ayat.com/