“... but rather everything we need to know to be saved is already written...”
So you go to confession as Our Lord commanded?
“Jesus said to them again, ‘Peace be with you. As the Father has sent me, even so I send you.’ And when he had said this, he breathed on them, and said to them, ‘Receive the Holy Spirit. If you forgive the sins of any, they are forgiven; if you retain the sins of any, they are retained.’ “
This is an apostolic gift for the formation of the church..it is ecclesiastical in nature and speaks to church discipline( excommunication) as we see in the epistles such as 1 Corth..
Clearly the apostles themselves did not understand it OR TEACH it as the roman church does.
Just one more misreading of the scriptures by Rome ...one more way to tie people to them