Last month, as an Italian documentary, Liberami, on exorcism won the best film at the Venice Film Festival, the country's most experienced exorcist, Father Gabriele Amorth, died aged 91.
Liberami's director Federica Di Giacomo, follows the efforts of Father Cataldo, a veteran exorcist in Sicily, in her movie.
In Frosinone, near Rome, another exorcist Father Ildebrando Di Fulvio, said when people asked for their relatives to be exorcised they were often ignoring more obvious issues like chronic depression or schizophrenia.
Father Di Fulvio claims to be able to spot when someone is possessed by a demon rather than in the thrall of mental illness.
He lists these as deformed facial expression; cavernous voice; spitting out food or metal objects; speaking in ancient languages; unnatural physical strength; and violent reactions to prayers and holy water.
Father Aldo Buonaiuto says 10 million Italians have consulted amateur exorcists but he says: "Most of them are charlatans who dupe desperate customers, but among them are some Satanists."