The belief in confession to a preist does not come from Tradition
From the Catholic Encyclopdia
as the Council of Trent declares, Christ principally instituted the Sacrament of Penance after His Resurrection, a miracle greater than that of healing the sick. "As the Father hath sent me, I also send you. When he had said this, he breathed on them; and he said to them: Receive ye the Holy Ghost. Whose sins you shall forgive, they are forgiven them; and whose sins you shall retain, they are retained' (John 20:21-23). While the sense of these words is quite obvious, the following points are to be considered:
Christ here reiterates in the plainest terms -- "sins", "forgive", "retain" -- what He had previously stated in figurative language, "bind" and "loose", so that this text specifies and distinctly applies to sin the power of loosing and binding.
He prefaces this grant of power by declaring that the mission of the Apostles is similar to that which He had received from the Father and which He had fulfilled: "As the Father hath sent me". Now it is beyond doubt that He came into the world to destroy sin and that on various occasions He explicitly forgave sin (Matthew 9:2-8; Luke 5:20; 7:47; Revelation 1:5), hence the forgiving of sin is to be included in the mission of the Apostles.
Christ not only declared that sins were forgiven, but really and actually forgave them; hence, the Apostles are empowered not merely to announce to the sinner that his sins are forgiven but to grant him forgiveness-"whose sins you shall forgive". If their power were limited to the declaration "God pardons you", they would need a special revelation in each case to make the declaration valid.
The power is twofold -- to forgive or to retain, i.e., the Apostles are not told to grant or withhold forgiveness nondiscriminately; they must act judicially, forgiving or retaining according as the sinner deserves.
The exercise of this power in either form (forgiving or retaining) is not restricted: no distinction is made or even suggested between one kind of sin and another, or between one class of sinners and all the rest: Christ simply says "whose sins".
The sentence pronounced by the Apostles (remission or retention) is also God's sentence -- "they are forgiven . . . they are retained".
It is therefore clear from the words of Christ that the Apostles had power to forgive sins. But this was not a personal prerogative that was to erase at their death; it was granted to them in their official capacity and hence as a permanent institution in the Church -- no less permanent than the mission to teach and baptize all nations. Christ foresaw that even those who received faith and baptism, whether during the lifetime of the Apostles or later, would fall into sin and therefore would need forgiveness in order to be saved. He must, then, have intended that the power to forgive should be transmitted from the Apostles to their successors and be used as long as there would be sinners in the Church, and that means to the end of time. It is true that in baptism also sins are forgiven, but this does not warrant the view that the power to forgive is simply the power to baptize. In the first place, as appears from the texts cited above, the power to forgive is also the power to retain; its exercise involves a judicial action. But no such action is implied in the commission to baptize (Matthew 28:18-20); in fact, as the Council of Trent affirms, the Church does not pass judgment on those who are not yet members of the Church, and membership is obtained through baptism. Furthermore, baptism, because it is a new birth, cannot be repeated, whereas the power to forgive sins (penance) is to be used as often as the sinner may need it. Hence the condemnation, by the same Council, of any one "who, confounding the sacraments, should say that baptism itself is the Sacrament of Penance, as though these two sacraments were not distinct and as though penance were not rightly called the second plank after shipwreck" (Sess. XIV, can. 2 de sac. poen.).
I'll give you that other religious groups wouldn't tolerate the bashing. Maybe I never got offended because my family always poked fun at each other's religions, nationalities, etc. - sounds strange to some people, but it was all in good fun at my house...back when my parents got along - oh my!
