And the RCC is not immune from it either , no denomination has a monopoly on the truth be it Catholic , Protestant or Eastern Orthodox
That too becomes a matter of interpretation. Being Catholic, I can share the Catholic insight. My Eastern brethren might not agree with the entirety of this conclusion as it relates to Peter, but we'll agree on the Church authority of the 7 Ecumenical Councils.
Jesus said something that speaks to this in some ways. In Matthew's Gospel it is recorded that Jesus said something foundational after Peter made his statement of faith in Christ as the Son of God...
Matthew 16:18-19
New Catholic Version
18 And I say to you: You are Peter, and on this rock I will build my Church, and the gates of the netherworld will not prevail against it. 19 I will give YOU the keys of the kingdom of heaven. Whatever YOU bind on earth shall be bound in heaven, and whatever YOU loose on earth shall be loosed in heaven.”
Here Jesus promises that not only would He build His Church on the foundation of Peter's confession, but that the very gates of Hell wouldn't prevail against it. This means that in spite of any of its sins or challenges it faces, it will overcome and prevail until the very return of the Savior who founded her.
Next, we read that Jesus grants Peter the "keys of the kingdom of heaven" and whatsoever Peter was to bind on earth would be bound in Heaven and whatsoever Peter loosed on earth would be loosed in Heaven. What is this "binding and loosing" business? It's actually a Jewish term. So, lets look at the Jewish Encyclopedia regarding this...
Binding and loosing (Hebrew, asar ve-hittir) . . . Rabbinical term for ‘forbidding and permitting'. The power of binding and loosing was always claimed by the Pharisees. Under Queen Alexandra, the Pharisees, says Josephus (Wars of the Jews 1:5:2), “became the administrators of all public affairs so as to be empowered to banish and readmit whom they pleased, as well as to loose and to bind.” . . . The various schools had the power “to bind and to loose”; that is, to forbid and to permit (Talmud: Chagigah 3b); and they could also bind any day by declaring it a fast day (Talmud: Ta’anit 12a). . . . This power and authority, vested in the rabbinical body of each age of the Sanhedrin, received its ratification and final sanction from the celestial court of justice (Sifra, Emor, 9; Talmud: Makkot 23b).
What Jesus is doing is appointing St. Peter the authority over this Church destined to prevail throughout history to "forbid and permit" as it relates to morals, teaching, and practice. It is this understanding that has grounded the Catholic Church and forged her unity throughout the ages, in spite of the humanity of those who are appointed the Seat of St. Peter.
Many wonder, but what about errors? This is a great question. Here's my understanding...
The One Holy Catholic and Apostolic Church of the Creeds is... Christ's Church. We Catholics believe Jesus preserves her from error through the Holy Spirit working in our Popes, Cardinals, Bishops, and Deacons, and those councils (the first being the Jerusalem Council in Acts 15, [Acts 15:28]) that have been appointed. This is precisely what Jesus promised
the 12...
John 16:12-14
New Catholic Bible
12 “I have much more to tell you,
but you would not be able to bear it now.
13 But when the Spirit of truth comes,
he will guide you into all the truth.
He will not speak on his own authority,
but he will speak what he hears,
and he will declare to you
the things that are coming.
14 He will glorify me,
for he will take what is mine
and communicate it to you.
Acts 15:28
New Catholic Bible
28 It is the decision of the Holy Spirit and also our decision not to lay any further burden upon you beyond these essentials:...
This authority given by Christ to Peter was delegated. And being delegated by Christ, it can be delegated by Peter. In the Second Epistle of Clement to James II it is recorded that Peter himself transferred this authority to live on after his death...
“I communicate to him the power of binding and loosing so that, with respect to everything which he shall ordain in the earth, it shall be decreed in the heavens; for he shall bind what ought to be bound and loose what ought to be loosed as knowing the rule of the Church.” (3:215)
So, instead of believing in thousands of different churches with thousands of different pastors who are allegedly led of the Spirit (who all disagree) we believe in a single pastor, or "Pope", of the Church, and a Magisterium who is guided by the Spirit. This doesn't mean all our Popes or leaders have been perfect. We've had some rascals. It's like the Presidency, not every American President has been on the up and up, but they are still the President. A Pope's position is only infallible if it doesn't violate Scripture, Sacred Tradition, and the established teachings of the Magisterium. For example, Francis spoke against the Latin Mass. Well, a church in my town boldly advertises... "LATIN MASS, Sundays 10 AM." LOL Why? Pope Francis' position on this isn't infallible. It bucks against Sacred Tradition and common historical practice. To condemn it would be to condemn every Catholic prior to Vatican II. LOL So, it's not as dictatorial as many might think. This is why some Popes and Councils have reversed the decrees of Popes by changing direction on those issues.
So, the Catholic believes only one Church was given the authority to definitively speak and define the truth. And that is the Church that after 2,000 years is still led by the one who sits in the Seat of Peter. She has not always lived up to her calling. However, in our understanding, she's the Church.