We have to be careful on what inspired means.
Inspired only refers to what is written. Inspired means God moved men to write what He wanted written and only what He wanted written.
But the word of God covers more than what is inspired.
For example, the Gospel that Jesus taught and preached was not inspired, because He did not write anything. He handed it down entirely by Tradition. But, it was the Word of God, because He is God.
The teachings He taught His Church are not inspired, since they were taught and not written, but, they are the word of God. Thus all the teachings that the apostles handed down and organized in the form of the Creed, Sacraments, Commandments and prayer, as presented in the Catechism of the Catholic Church, since they were taught and not written by God are not inspired, but, they ARE the Word of God.
The two most important distinctions is that ALL the teachings of Jesus are handed down ONLY in Tradition, that is, He taught the apostles everything, regarding the Gospel. (john 15:15) Only certain elements of that Tradition were written in the Gospels.
The second disctinction is that Jesus said salvation comes from believing the Gospel the apostles taught and preached. (mark 16:15-16) 15He said to them, “Go into all the world and preach the good news to all creation. 16Whoever believes and is baptized will be saved, but whoever does not believe will be condemned.”
Thus salvation (liberation from our sins) comes from believing the Tradition the Church hands down, from hearing the Word of God, in Tradition that is taught and preached. It cannot come from reading.
St. Paul says the same thing.
“Now, brothers, I want to remind you of the gospel I preached to you, which you received and on which you have taken your stand. By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain.“ 1 Corinthians 15:1-3*(NIV)
Thus, the bible is a witness to the teaching that Salvation come from believing what is** taught and preached** (handed down in Tradition), it cannot come from reading Scripture.
Why is this?
Because Scripture is basically salvation history. A history of God’s intervention amoung His people. This history does have some teachings mixed in, but not complete, not organized for teaching as in a catechism, for it is history. The Gospels are narratives of the life of Jesus, they are NOT the organized teachings of Jesus.
The Gospel the apostles taught and preached, and organized into the form of the Creed, Sacraments, Commandments and Prayer, and handed down as the Catholic Faith, are the teaching form of the Gospel, with a little salvation history thrown in. They were intended from the outset to be the teachings of salvation. They were not intended to be anything else. In Matthew Jesus told the apostles, “Teach them to observe ALL that I have commanded you”.
So the apostles were commanded to teach, not write, what Jesus taught and did not write. And they had to follow the example of Jesus. Since Jesus taught and did not write His Gospel, they had to teach and not write the Gospel. The Catechism presents this Gospel. It is not inspired, just as the Gospel that Jesus taught was not inspired. But since the teachings come from God, then all the teachings in it that are presented as coming from God are the Word of God.
Later on the Holy Spirit moved some men to write the New Testament, which is salvation history of the life of Jesus and the early Church. It nowhere, not in any book, chapter or verse claims to be the Gospel that the Apostles and St. Paul taught and preached, and which was so extensive that Jesus had to sent the Holy Spirit to teach the apostles “all things” and to remind them of all that He taught them.
Why do we call the four Gospels of the bible “Gospels” even though no where do they claim to present the entire Gospel the apostles learned from Jesus and the Holy Spirit? Because they present the life of Jesus, and from the example of His life we also learn to know Jesus and how He wants us to live. So while we can only learn the Gospel from Tradition, from what the Church teaches and preaches, the Church teaches that we learn to know God also through the knowledge of His life and actions on this earth. Thus, the Church teaches, not to know scripture is not to know Christ.
In Scripture we learn salvation history, and knowledge of the life of Jesus.
In Tradition we learn the ALL the teachings of the Gospel that the Church learned from Jesus and the Holy Spirit.
So you see why Protestants, or anyone, cannot learn the Gospel by reading scripture.
For example, they have no idea what Jesus meant when He said, “This is My body”
They can guess, speculate, study and propose, but they do not know what He meant.
This is because scripture was not intended to teach doctrine, but only salvation history and the life of Jesus, and it was intended to be a “witness” to the teachings, to “nourish” the teachings and to “illuminate” the teachings of the Gospel that the Church learned directly from God.
Only in Tradition are the teachings of the Gospel handed down entirely and in a form in which God intended us to learn. And it is only through the teaching authority of His Church that the Holy Spirit preserves these teachings without error.