If you read the article at http://www.raidersnewsupdate.com/petrus.htm it says "The secret of Malichi Martin and Rosemary's (Petrus) Baby."  Maybe Malachi Martin, who wrote The Keys of This Blood and Windswept House, knew the real name of the last pope Petrus, and maybe the last pope Petrus would be fathered by Satan.  (This is only a guess on my part.)  I have also wondered if Peter Hans Kolvenbach, who used to be the Black Pope of the Vatican, would one day be pope Petrus, Romanus.