If Peter really was "all that" why did Paul never once mention it. He also never once mentioned any of the things DeMontfort says about Mary. How could it be that the person who wrote most of the NT via the Holy Spirit failed to mention this? Never is Pope or the human vicar of Christ or his infalibility or his word being equal to scripture every once mentioned in the bible. So how could those verses possibly mean what you suggest they mean?
“If Peter really was "all that" why did Paul never once mention it. … So how could those verses possibly mean what you suggest they mean?”
Most of the epistles were written to local churches in order to help with moral or doctrinal problems. There was no attempt to impart a vast body of basic doctrinal instruction to non-believers, or even to simply summarize everything for the believers who received the letters. This is why Paul never had to write about Peter as the head of the Church. They all knew this to be true. This is why Paul had to write to the Corinthians about the real presence of Christ in the Eucharist. “Therefore, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord. A man ought to examine himself before he eats of the bread and drinks of the cup. For anyone who eats and drinks without recognizing the body of the Lord eats and drinks judgment on himself.”1 Corinthians 11:27 When Christ said “This is My Body”, we Catholics do not have to determine what the meaning of “is” is. We believe what Jesus said.
Non-Catholics have a real problem, in that they believe that all they need to believe is in the Bible. However, the Bible itself never makes that claim. The Bible never says that the Bible is sufficient and all one needs. This belief is a tradition of man. The Bible is God-breathed and useful, yes, but where does the Bible say that it is sufficient? “But as for you, continue in what you have learned and have become convinced of, because you know those from whom you learned it, and how from infancy you have known the Holy Scriptures, which are able to make you wise for salvation through faith in Christ Jesus. All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the man of God may be thoroughly equipped for every good work. 2 Timothy 3:14-17
The Scripture that Timothy studied in his infancy was the Old Testament. Paul said nothing about the New Testament here, much of which was not yet written at the time.
So, where in the Bible does the Bible say it is all you need for salvation?
It doesn’t. We have over 20,000 denominations that make the claim that they have the proper interpretation of scripture. If Martin Luther would have had his way, you would have a Bible without the letter to James. “You see that a person is justified by what he does and not by faith alone.” James 2:24 This didn’t agree with his interpretation of salvation by faith alone, so he wanted to take that one out as well. (“Tell them Martin Luther says it is so”). Jesus wanted us to be one. “I appeal to you, brothers, in the name of our Lord Jesus Christ, that all of you agree with one another so that there may be no divisions among you and that you may be perfectly united in mind and thought. My brothers, some from Chloe's household have informed me that there are quarrels among you. What I mean is this: One of you says, “I follow Paul”; another, “I follow Apollos”; another, “I follow Cephas”; still another, “I follow Christ.” Is Christ divided? Was Paul crucified for you? Were you baptized into the name of Paul? 1 Cor 1:10-13 We cannot be one if everyone brings his own version of the Truth. Christ was not stupid, and He knew He had to establish a visible Church with authority to keep men from twisting His words. He did just that.
The Catholic Church has existed for nearly 2,000 years. This is testimony to the Church’s divine origin. Jesus promised, "I will build my Church and the gates of hell will not prevail against it" (Matt. 16:18). This means that His Church will never be destroyed and will never fall away from Him. Jesus established His Church and assured the apostles and their successors, the popes and the bishops, "He who listens to you listens to me, and he who rejects you rejects me" (Luke 10:16). He gave them authority, "Whatever you bind on earth shall be bound in heaven" (Matt. 18:18). Jesus promised to guide his Church into all truth (John 16:12–13). We can have confidence that His Church teaches only the truth.
So my brother in Christ, I ask you two questions:
Where in the Bible does it say that the Bible is all you need to believe for salvation?
What is your authority for interpreting scripture?