Pone, Domine, custodiam ori meo, et ostium circumstantiae labiis meis.
Sedevacantism, put simply, is the position that the Holy See is currently vacant and that there is no Roman Pontiff. This happens when a Pope dies, resigns, or when the Pope has become a manifest heretic.
“A pope who is a manifest heretic automatically (per se) ceases to be pope and head, just as he ceases automatically to be a Christian and a member of the Church. Wherefore, he can be judged and punished by the Church. This is the teaching of all the ancient Fathers who teach that manifest heretics immediately lose all jurisdiction.” - St. Robert Bellarmine De Romano Pontifice, II, 30
"Adding that if at any time it will be found that some bishop, even conducting himself as an archbishop or patriarch or already mentioned cardinal of the Roman Church, even, as shown, a legate, or even a Roman Pontiff, before his promotion or assumption as cardinal or as Roman Pontiff had deviated from the Catholic Faith or fallen into some heresy, before his promotion or assumption as Cardinal or as Roman Pontiff, that promotion or assumption concerning him, even if made in concord and from the unanimous assent of all the cardinals, is null, void and worthless..." - Pope Paul IV CUM EX APOSTOLATUS OFFICIO
“Now when the Pope is explicitly a heretic, he falls ipso facto from his dignity and out of the Church…” - St. Francis De Sales, Bishop and Doctor of the Church: The Catholic Controversy, TAN Books, pp. 305-306
We hope these above quotes will suffice in proving the position that if the Pope falls into heresy then he immediately loses all jurisdiction and authority and is not the Pope. This leaves us with the question as to when this happened and how could this happen? We hold the position that Antipope John XXIII through Francis I are manifest heretics and that they are not Popes due to teaching and promulgating heresy.
From here we will provide articles and information related to common objections against the sedevacantist, as well as articles and videos to help you better understand the sedevacantist position. We will avoid writing too many articles about these subjects/objections as they've been written about ad nauseam by priests, bishops, and educated laymen who have studied canon law and ecclesiology far more than we have.
Before we begin it would be good to note that there is a sedevacantist group who are commonly referred to as the Dimond Brothers, they run a website known as VaticanCatholic.com. They hold to the heretical notion that Baptism of Desire/fire, Baptism of Blood, and invincible ignorance are heretical doctrines and they deny these. Fr. Feeney was the one who promulgated this idea and was subsequently excommunicated by Pope Pius XII in 1953. Feeneyites, as they are called, should be avoided at all costs. They are pernicious heretics and very uncharitable.