The following contains the official standing of the Roman Catholic Church regarding the authority of their Pope and salvation. This is a peculiar doctrine that one must obey the Pope or be condemned since most the Catholics that I know are partially ecumenical claiming to accept most sects of Christendom. The thoughts of some Roman Catholics are very welcome here. The necessity of following the Roman Pope is found under “Unam Sanctam” of the Catholic Encyclopedia. Unam Sanctam means “the One Holy” and refers to the Roman Pontiff. The following are the official doctrines of the Roman Catholic Church concerning the supremacy of the Pope and sealed by Pope Boniface VIII.
“The Bull lays down dogmatic propositions on the unity of the Church, the necessity of belonging to it for eternal salvation, the position of the pope as supreme head of the Church, and the duty thence arising of submission to the pope in order to belong to the Church and thus to attain salvation.”
“First, the unity of the Church and its necessity for salvation are declared and established by various passages from the Bible and by reference to the one Ark of the Flood, and to the seamless garment of Christ. The pope then affirms that, as the unity of the body of the Church so is the unity of its head established in Peter and his successors. Consequently, all who wish to belong to the fold of Christ are placed under the dominion of Peter and his successors.“
Quotes from the Bull, which is the Official Papal Affirmation presented in the Catholic Encyclopedia,:
“Now, therefore, we declare, say, determine and pronounce that for every human creature it is necessary for salvation to be subject to the authority of the Roman pontiff…”
“It is here stated that for salvation it is necessary that every human creature be subject to the authority of the Roman pontiff.“
Referring to the last quote,
“This definition, the meaning and importance of which are clearly evident from the connection with the first part on the necessity of the one Church for salvation, and on the pope as the one supreme head of the Church, expresses the necessity for everyone who wishes to attain salvation of belonging to the Church, and therefore of being subject to the authority of the pope in all religious matters. This has been the constant teaching of the Church, and it was declared in the same sense by the Fifth Ecumenical Council of the Lateran, in 1516:…‘That it is of the necessity of salvation for all Christ’s faithful to be subject to the Roman pontiff.’” (Kirsch, J.P. (1912). Unam Sanctam. In The Catholic Encyclopedia. New York: Robert Appleton Company. Retrieved November 13, 2012 from New Advent: newadvent.org/cathen/15126a.htm)