Disagreement is limited to smaller questions of lesser importance.
https://en.m.wikipedia.org/wiki/Second_Vatican_Council
Where does it say this in Scripture? Bible alone?
Romans 3:3 - 3:4
Now viewing scripture range from the book of Romans chapter 3:3 through chapter 3:4...
Romans Chapter 3
3 For what if some did not believe? shall their unbelief make the faith of God without effect?
4 God forbid: yea, let God be true, but every man a liar; as it is written, That thou mightest be justified in thy sayings, and mightest overcome when thou art judged.
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Let God be true, and every man a liar.
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Galatians 1:1
“Paul, an apostle, (not of men, neither by man, but by Jesus Christ, and God the Father, who raised him from the dead;)”
Galatians 1:8 - 1:9
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Galatians Chapter 1
8 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
9 As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed.
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Any apostle ( Paul says but though we ), any angel from heaven, any man, has it said about him "let him be accursed" if he preach any other gospel unto you Than that which was preached.
Where is the gospel?
In the Bible.
The Bible is the standard, no one and nothing else.
Not an organization? It sure seems to me that Christ here was establishing an organization.
Matthew 16:18-19:
"And I tell you, you are Peter, and on this rock I will build my church, and the gates of hell shall not prevail against it. I will give you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven."
These are choice words our Lord gave to an Apostle who, in your view, is just one of several in a mere ragtag group of believers.
1 Timothy 1:15
“This is a faithful saying, and worthy of all acceptation, that Christ Jesus came into the world to save sinners; of whom I am chief.”
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Galatians 1:1
“Paul, an apostle, (not of men, neither by man, but by Jesus Christ, and God the Father, who raised him from the dead;)”
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Galatians 1:8 - 1:9
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Galatians Chapter 1
8 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
9 As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed.
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Acts 14:8 - 14:18
Now viewing scripture range from the book of Acts chapter 14:8 through chapter 14:18...
Acts Chapter 14
8 And there sat a certain man at Lystra, impotent in his feet, being a cripple from his mother's womb, who never had walked:
9 The same heard Paul speak: who stedfastly beholding him, and perceiving that he had faith to be healed,
10 Said with a loud voice, Stand upright on thy feet. And he leaped and walked.
11 And when the people saw what Paul had done, they lifted up their voices, saying in the speech of Lycaonia, The gods are come down to us in the likeness of men.
12 And they called Barnabas, Jupiter; and Paul, Mercurius, because he was the chief speaker.
13 Then the priest of Jupiter, which was before their city, brought oxen and garlands unto the gates, and would have done sacrifice with the people.
14 Which when the apostles, Barnabas and Paul, heard of, they rent their clothes, and ran in among the people, crying out,
15 And saying, Sirs, why do ye these things? We also are men of like passions with you, and preach unto you that ye should turn from these vanities unto the living God, which made heaven, and earth, and the sea, and all things that are therein:
16 Who in times past suffered all nations to walk in their own ways.
17 Nevertheless he left not himself without witness, in that he did good, and gave us rain from heaven, and fruitful seasons, filling our hearts with food and gladness.
18 And with these sayings scarce restrained they the people, that they had not done sacrifice unto them.
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^ Look at their own words ( specifically Acts 14:15 ).
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Psalms 18:2 - The LORD is my rock, and my fortress, and my deliverer; my God, my strength, in whom I will trust; my buckler, and the horn of my salvation, and my high tower.
2 Samuel 22:32 - For who is God, save the LORD? and who is a rock, save our God?
Matthew 16:18 - And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it.
1 Samuel 2:2 - There is none holy as the LORD: for there is none beside thee: neither is there any rock like our God.
1 Corinthians 10:4 - And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ.
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And about the rock, God, Jesus Christ, is the rock, not Peter.