That can be said of many theological facts. The Holy Scripture is the written testimony of things that Christ and the apostles said and did, as remembered 10-30 years later by the disciples. It is also a collection of letters written when the apostle writing them could not travel and teach in person; the letters give encouragement and correct errors that occurred in the Church at the time. The Holy Scripture is not, was not intended as, and cannot be a complete theological manual.
It is a gross error of the Protestant to treat the Scripture as a complete rule of faith, the role that Christ intended for the Catholic Church:
I will build my church, and the gates of hell shall not prevail against it. And I will give to [Peter] the keys of the kingdom of heaven. And whatsoever thou shalt bind upon earth, it shall be bound also in heaven: and whatsoever thou shalt loose upon earth, it shall be loosed also in heaven. (Matthew 16:18-19)
And we see the root problem with the catholic church.
2 Timothy 3:New King James Version (NKJV)
10 But you have carefully followed my doctrine, manner of life, purpose, faith, longsuffering, love, perseverance, 11 persecutions, afflictions, which happened to me at Antioch, at Iconium, at Lystra—what persecutions I endured. And out of them all the Lord delivered me. 12 Yes, and all who desire to live godly in Christ Jesus will suffer persecution. 13 But evil men and impostors will grow worse and worse, deceiving and being deceived. 14 But you must continue in the things which you have learned and been assured of, knowing from whom you have learned them, 15 and that from childhood you have known the Holy Scriptures, which are able to make you wise for salvation through faith which is in Christ Jesus.
16 All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, 17 that the man of God may be complete, thoroughly equipped for every good work.
2 Timothy 4 New King James Version (NKJV)
4 I charge you therefore before God and the Lord Jesus Christ, who will judge the living and the dead at His appearing and His kingdom: 2 Preach the word! Be ready in season and out of season. Convince, rebuke, exhort, with all longsuffering and teaching. 3 For the time will come when they will not endure sound doctrine, but according to their own desires, because they have itching ears, they will heap up for themselves teachers; 4 and they will turn their ears away from the truth, and be turned aside to fables. 5 But you be watchful in all things, endure afflictions, do the work of an evangelist, fulfill your ministry.
The apostle Paul was clearly convinced of Scriptures.
I will build my church, and the gates of hell shall not prevail against it. And I will give to [Peter] the keys of the kingdom of heaven. And whatsoever thou shalt bind upon earth, it shall be bound also in heaven: and whatsoever thou shalt loose upon earth, it shall be loosed also in heaven. (Matthew 16:18-19)
Well, as you can see from many, though not all, of the dissenting posts on this thread, this verse becomes cast aside, as it would acknowledge the Primacy of Peter and his successors, the next 15 of which were martyred for their Faith.
Read the thread and you can see. It's easier for some dissenters to make fun like spoiled children, criticize like bullies on the school playground, and to interpret the Bible as they themselves see fit.
Note also how very few have ventured to declare a denomination, a spiritual director, a mentor they can trace farther back than his/her (the mentor's) own dissention; nor do they say how they found their own beliefs, what it was that brought them to where they are now.
See how few dissenting posts there are which proclaim the writer's faith; rather the "contributor" finds it necessary to bash Catholicism in order to justify their own erroneous beliefs.
We must love ALL our brothers and sisters in humanity; we must continue to pray for them all, whether they are genuinely concerned with our spiritual welfare (as I sincerely believe some truly are), or not.
There are always those who are willing to have a mature, adult discussion; yet there are those who are not capable of doing so, and use childish tactics unworthy of a Follower of Christ. By their fruits you shall know them.
There does come a time when we must walk away, on the strength of our own beliefs, shaking the dust from our feet, in a wise, yet gentle manner. I've personally heard it all before, and it has not shaken my Catholic Faith. I chose It and I believe It with all my heart!
God bless you!