While there is no way of knowing whether the specific charges raised in this book by a renowned Catholic exorcist are true or not, the fact that Satan has been able to exert influence within the very heart of the Church has been established since Judas.
Excerpts from the related article from the Catholic News Agency.
“Rome, Italy, Mar 3, 2010 / 04:20 pm (CNA).- A renowned exorcist in Rome recently released a book of memoirs in which he declares to know of the existence of Satanic sects in the Vatican where participation reaches all the way to the College of Cardinals. A second demonologist, also residing in Rome, entered the debate this week, clarifying the origins of the information and defending the Vatican's clergy as an "edifying and virtuous" collection of prelates.
“In a book of memoirs released in February, the noted Italian exorcist Fr. Gabriele Amorth affirmed that "Yes, also in the Vatican there are members of Satanic sects." When asked if members of the clergy are involved or if this is within the lay community, he responded, "There are priests, monsignors and also cardinals!"
“The book, "Father Amorth. Memoirs of an Exorcist. My life fighting against Satan." was written by Marco Tosatti, who compiled it from interviews with the priest.
“Fr. Amorth was asked by Tosatti how he knows Vatican clergy are involved. He answered, "I know from those who have been able to relate it to me because they had a way of knowing directly. And it's something 'confessed' most times by the very demon under obedience during the exorcisms."