“Sacred theology rests on the written word of God, together with sacred tradition, as its primary and perpetual foundation.”(*Dei Verbum * 24) You ask, are the scriptures enough to base one’s faith on, or are the traditions of the Church? It’s not one or the other; it’s both. “For both of them, flowing from the same divine wellspring, in a certain way merge into a unity and tend toward the same end. For Sacred Scripture is the word of God inasmuch as it is consigned to writing under the inspiration of the divine Spirit, while sacred tradition takes the word of God entrusted by Christ the Lord and the Holy Spirit to the Apostles, and hands it on to their successors in its full purity, so that led by the light of the Spirit of truth, they may in proclaiming it preserve this word of God faithfully, explain it, and make it more widely known….It is not from Sacred Scripture alone that the Church draws her certainty about everything which has been revealed. (ibid 9). Scripture and Tradition together convey the Word of God (ibid 10).
The Church has always taught, at least from the time of St. Paul, that scripture is to be read and interpreted in the light of the Church’s tradition. Remember, [Holy] Tradition pre-dates Scripture. No verse in scripture supports the idea that the bible is our only rule of faith. “Protestants must take 2 Timothy 3:16-17 out of context to arrive at the theory of sola scriptura. But when the passage is read in context, it becomes clear that it is teaching the importance of apostolic tradition!” catholic.com/library/Scripture_and_Tradition.asp
“The Catholic Church’s teaching on papal infallibility is one which is generally misunderstood by those outside the Church. In particular, Fundamentalists and other “Bible Christians” often confuse the charism of papal “infallibility” with “impeccability.” They imagine Catholics believe the pope cannot sin. Others, who avoid this elementary blunder, think the pope relies on some sort of amulet or magical incantation when an infallible definition is due.
Given these common misapprehensions regarding the basic tenets of papal infallibility, it is necessary to explain exactly what infallibility is not. Infallibility is not the absence of sin. Nor is it a charism that belongs only to the pope. Indeed, infallibility also belongs to the body of bishops as a whole, when, in moral unity, they solemnly teach a doctrine as true. We have this from Jesus himself, who promised the apostles and their successors the bishops, the magisterium of the Church: “He who hears you hears me” (Luke 10:16), and “Whatever you bind on earth shall be bound in heaven” (Matt. 18:18).”
Scripture and Tradition: catholic.com/library/Scripture_and_Tradition.asp
Papal Infallibility: catholic.com/library/Papal_Infallibility.asp