In the body of believers everyone is a preist.
No one is a priest for any one else--N
NE!
We are a kingdom of priests and kings BEFORE God, not before men.
We cannot intercede ON BEHALF of anyone.
That system was done away with in the OT.
1 Timothy 2:5 For
there is one God, and one mediator between God and men, the man Christ Jesus;
There is only one mediator, one person that can come between man and God, and that is Christ himself. No priest can do that work.
Hebrews 4:14 Seeing then that we have a great high priest, that is passed into the heavens, Jesus the Son of God, let us hold fast
our profession.
Hebrews 4:15 For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as
we are, yet without sin.
Hebrews 4:16 Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need.
1. We have a great high priest, a priest that is much better than any of the OT priests, a priest that is far better than any earthly priest, a priest that puts all RCC priests out of business if you would believe the Bible.
2. He was tempted in all points like as we are. He can empathize with us in all our trials. An earthly priest cannot do that.
3. At any time, any moment we can come straight before his very throne of grace in time of need and find mercy, grace and help. That was not so in the OT, and it is not so in the RCC. Only Christ can do that.
However, some members function as the church administrators and have special functions that only apply to them. In the Catholic Church The bishop conveys the sacraments and his priest support and help him with that. The layity do not have that function but are responsible for evangalization, they can baptize, etc...
And all of that is not Biblical.
Look at your example that you gave, and consider the context.
2 Corinthians 2:5-10 But if any have caused grief, he hath not grieved me, but in part: that I may not overcharge you all. Sufficient to such a man
is this punishment, which
was inflicted of many. So that contrariwise ye
ought rather to forgive
him, and comfort
him, lest perhaps such a one should be swallowed up with overmuch sorrow.
--Understand what Paul is talking about here. The one that caused grief is someone that had committed a serious sin.
You ought to forgive him. It may have been the same person in 1Cor.5:1-5 who had committed gross immorality, but now had repented. Upon repentance he should be admitted back into the church but the church was reluctant to do so. Paul had written a stern letter about their lack of forgiveness or their unwillingness to accept his repentance and forgive him for his wrong. It was a stern letter.
They should accept him "lest such a one should be swallowed up with overmuch sorrow."
Wherefore I beseech you that ye would confirm
your love toward him.
--Again, show your love toward this one who has repented.
For to this end also did I write, that I might know the proof of you, whether ye be obedient in all things.
--This is the reason Paul did write that letter. That they might obey. He wanted "proof" of their obedience. He wanted to see a demonstration of their willingness to see them forgive this man.
To whom ye forgive any thing, I forgive also: for if I forgave any thing, to whom I forgave it, for your sakes forgave I it in the person of Christ;
This last verse is a bit ambiguous in the KJV.
Look again in the WEB
2 Corinthians 2:10 Now I also forgive whomever you forgive anything. For if indeed I have forgiven anything, I have forgiven that one for your sakes in the presence of Christ,
He is saying that he is with them in forgiving this person. As you forgive this person so do I. The sense is: I have confidence in you, as a church, that as you forgive this person's offense, I shall approve of the act.
Paul did not forgive anyone's sins. 
