From what I understand, in Catholicism the penitent goes to a mortal, tells him what s/he has done, and that mortal prescribes something by which the penitent can be forgiven. The mortal = priest is seen as an agent whereby Jesus Christ forgives sins.
You understand wrong. The mortal does not prescribe something by which the penitent can be forgiven. One goes to the priest, confesses the sins, the priest, with the authority of Jesus Christ, tells the penitant s/he is forgiven, to say the Act of Contrition* (a prayer admitting that one does not like to sin, one does not wish to sin, and that, by following God, we hope to cease to sin). We may also be prescribed a penance.
OUR FORGIVENESS IS INDEPENDANT OF DOING THIS WORK. Pennance is so that we can, in someway, whether by prayers or good deeds, continue to stay close to God. We have just mended the riff by going to Confession, we hope we can keep it that way and it is easier to do this if we have specific prayers to do, specific things to think about, specific actions to do or stay away from. Again, it is just because we choose to go to the priest in humility and confess our (mortal, venial do not have to be confessed) sins, out loud, and that we are truly sorry for having done the sins, and that we will try in the future to not do them (planning to sin again negates the validity of Confession as does not confessing all mortal sins) is what makes us forgiven. We have the strength, and the ability to admit that we have sinned and because we are doing what God told us to do, because we trust in God that much, we are forgiven.
Among my church group and similar church groups, we believe Jesus Christ forgives sins directly without the mediating agent. I believe that is what Scripture teaches. Since I do not want someone else knowing my private sins, and it is unnecessary, I will not do it.
We believe that, too. We believe that a perfect act of Contrition will sincerely be enough for forgiveness, BUT, since some people have more of a fear of ending up in Hell than dispising offending their Creator, we also have the option of Confession (God makes things so easy for us). BUT, how do you know your sins are forgiven? When one goes to a priest, and the priest says, “Your sins are forgiven,” accepting that one did not hold anything back…and one is not scrupulous, one knows. Did you know that St. Padre Pio wouldn’t give a woman absolution because he was blessed with knowing the sins of the penetant? She wasn’t making a full confession, and even after he told her to go and pray and ask God what she did wrong, after she came back she couldn’t get absolution. This happened one more time with this woman. It turns out she had an abortion (I’ve heard this story, I haven’t read it myself). Not all priests have this gift, but, with confession, we do know our sins are forgiven.
You bring up an interesting point, you do not want anybody else to know your sins. That’s what it’s really all about, isn’t it? You want to keep your sins to yourself. It’s bad enough you know them, it’s bad enough God knows them, why get somebody else involved, but, all sin is communal. You sins affect the rest of the world in some way. This is one of the reasons that in the confessional from the time the priest says, “In the Name of the Father, and of the Son, and of the Holy Spirit,” the seal of confession is in place. One can confess face to face or behind a screen, but, whatever you tell that priest stays in that room, or, within that confessional (there’s no doors for the penetant in the confession booths at St. John Cantius in Chicago). As a matter of fact, I, while in confession, asked the priest something and he told me to tell him again after he gave me absolution. After absolution, he can repeat what he says. This still, though, doesn’t affect that you don’t want the priest to know because you don’t want anybody to know; again, this goes to a humility issue. It’s not easy to tell somebody else (lest of all, admit, out loud, which makes it much harder) how you are weak and how you have failed. You also believe it unecessary; let me state somethings as to how this can be justified in the Bible. God already knows what you done, He still wants you to admit it. In the occurance of the Garden of Eden, God knew what had transpired, BUT, He wanted Adam and Eve to admit their sins. He gave them plenty of opportunity and they kept dodging the question, trying to alleviate themselves of disobedience. Same thing with Cain and Abel. God knew what had happened and He asked Cain, and Cain wouldn’t tell Him. Same thing in the New Testament with Jesus at the Well. Jesus wanted the woman to admit her sins to Him, but, again, she skirted around the issue. It is a VERY uneasy thing to do, to admit one is wrong in the presence of God
Mind you, I have no problem with Christians who do go tell a priest their private sins. I just gave you the reasons of others, and I gave you my reasons. I understand that most priests never reveal what is said in confession, but I still am not telling my sins to someone who does not need to know them.
I hope I have cleared up why we do what we do. I hope my explinations helped to clarify and should this ever come up at a dinner party, or, you’re ever on Jeopardy, and there’s some pennance question, you now have an answer.
*Oh my God, I am heartily sorry for having offended you and I detest all my sins because I dred the loss of Heaven and the pains of Hell, but, most of all, because they offend you, my God, who are all good and deserving of all my love. With your help I firmly resolve to go to Confession, to do my pennance, and to ammend my life. Amen.