Jesus founded His Church on the Apostles of which one was head Apostle, all of whom initially taught only orally with the inspiration of the Holy Spirit, and then many years later, some of this same inspired teaching was written down. In Antioc where the Church first started calling themselves Christian, the Church started being called catholic as it grew, and the formal word Catholic was meant to be and was used interchangeably with the term Christian which this same community came up with. The Apostles were Catholic men and the early Church was Catholic. Catholic men wrote New Covenant Scriptures with the inspiration of the Holy Spirit. Other opposing texts were put into society not by God’s Church. The Catholic Church with the guidance and protection of the Holy Spirit sorted out which of the texts in circulation were truly inspired, amidst the texts also claiming to be inspired. That same Church still has the protection of the Holy Spirit to teach what is in the texts that she authored. No ecclesial community apart from the Catholic Church has the ability to teach infallibly what the truths are which are contained in Scriptures. Only this one Church was created by Christ for this purpose, and all people can come to know the fullness of revealed truth only through the one Church created by Christ of which He is Head.
In addition, Jesus founded His one Church on the Rock of Peter, the visible Prime Minister of the King’s earthy Kingdom. Christ said that the gates of Hell would never prevail against this Church, which He founded and built. Christ founded the early Church first on the Apostles with Peter has head Apostle. He gave the Apostles the Holy Spirit which would enable them to recall His deposit of faith which He gave them, and to teach without error. This teaching was done orally, with nothing written down for many years. So, the Church was based on the authority and oral teaching of the Apostles. The Apostles started ordaining other Bishops as the Church grew to fulfill its universal mission given by Christ. Beginning around approximately twenty years after Christ ascended, the Catholic men started writing down these oral teachings, sometimes in the form of reproof to a Catholic community, so that some of the deposit of faith was recorded in the written word. The last of the New Covenant inspired writing was completed by about 100 AD. During this time, there were heretics which would put out texts alleging to be inspired, but were not. It took until 350 years after Christ ascension before the Bishops of the growing Church would meet, and sort out which of the texts in existence were truly inspired and which were not. The list of inspired texts determined by Catholic Church with the protection of the Holy Spirit came to be known as the Bible.
This Church founded by Christ on the rock of Peter still exists today, and just as Christ said, the gates of Hell have not prevailed against this Church. The Church that Christ founded on the authority of the Apostles with one head Apostle teaching God’s word orally, had also written some of this authoritative teaching down to pass along this way. So, the teachings of the early Church are Catholicism. The New Testament is some of the oral teachings written down, and so the NT is Catholicism, but not all of Catholicism. God’s Church is more than just the written teachings. God has done this so we would have the true teachings about Him. If you are ignorant of Catholic teachings, you are indeed ignorant of what Christ has revealed to the world about God.
Sadly, many are ignorant of God’s Church which He established so we would know the fullness of revealed truth, the Catholic Church with the office of Peter as Prime Minister for the earthly part of the King’s Kingdom. Trusting Christ means trusting His teachings through His Church. If you don’t trust God’s teachings through the Catholic Church, then you don’t truly trust Christ’s authentic teachings, and will remain ignorant of our Lord.