Demon
The contemporary Roman Catholic Church unequivocally teaches that angels and demons are real beings rather than just symbolic devices. The Catholic Church has a cadre of officially sanctioned exorcists which perform many exorcisms each year. The exorcists of the Catholic Church teach that demons attack humans continually but that afflicted persons can be effectively healed and protected either by the formal rite of exorcism, authorized to be performed only by bishops and those they designate, or by prayers of deliverance, which any Christian can offer for themselves or others.
Witchcraft
It is a common belief that jinn can possess a human, thus requiring exorcism ("ruqya") derived from the Prophet's "sunnah" to cast off the jinn or devils from the body of the possessed. The practice of seeking help from the jinn is prohibited and can lead to possession. The "ruqya" contains verses of the Qur'an as well as prayers specifically targeted against demons. The knowledge of which verses of the Qur'an to use in what way is what is considered "magic knowledge."