In context, Paul exhorted the Church of Corinth to discipline a man who was living in sin. Verse eight was a call for them to restore fellowship with that person. Verse nine is the author's reminder of writing to them. Paul is saying that if they forgive someone and say that he is repentant, then he will restore with them as well because he has trust with them. He is telling them to return the favor. He is saying the sinner is repentant. So the Corinthian Christians were told to receive him back.
The Roman Catholic dogma of confession to a priest expressly contradicts the teaching of the New Testament. There is one mediator between God and mankind, and His name is Jesus Christ (1 Timothy 2:5-6). Only He can make atonement for our sins. Only He can reconcile us to a holy God. Thus, the Roman Catholic priest is self-deceived and stopping others from entering into the kingdom of heaven. The concept of an ordained ministerial priesthood is nowhere to be found in the New Testament.
1 John 1:7-9 mentions God thoroughly cleansing believers who confess their sins to Him. An ordained ministerial priest is not mentioned in that context. The Roman Catholic priest is actually unnecessary because Christ lives forever to make intercession before the Father for those who have placed their trust in Him (Hebrews 7:24-25). His priesthood cannot be transferred to anybody. Who does the Roman Catholic priest confess his sins to, another priest? This tradition is foolish. How can there be an ordained, ministerial priesthood when no more offerings exist for sin (Hebrews 10:17-18)?