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.
Exorcist
Since at least the third century, the Latin Church has formally ordained men to the minor order of exorcist. Text previously attributed to a fourth Council of Carthage (398), now identified as a collection called "Statuta Ecclesiæ Antiqua", prescribes in its seventh canon the rite of ordination of such an exorcist: the bishop is to give him the book containing the formulae of exorcism, saying, "Receive, and commit to memory, and possess the power of imposing hands on energumens, whether baptized or catechumens".