As a protestant myself who agrees with confession, let me answer:
I believe the controversy is on necessary and some would say absolutely necessary
any educated protestant can look back to the reformation and read luther in his minor catechism where he says this:
How people are to be taught to confess
What is confession?
Confession consists of two parts. One is that we confess our sins. The other is that we receive the
absolution, that is, forgiveness, from the pastor as from God himself and by no means doubt but firmly believe that our sins are thereby forgiven before God in heaven.
Same with the anglicans, they use it very similar. Now let me say if they are protestants and believe as I do the scripture goes first, they should take a look to John 20:23 in greek and do serious exegesis.
Now let me show you an answer of Dr, Larry Hurtado (keep in mind he is one of the authorities on new testament) (and he is protestant) to one of my question on his blog:
Me:
Professor Hurtado Could you answer me this,
Let me first to thank you for your future answer and all what I haver learnt from your books and podcast.
Now here I go with the question:
If I am not wrong in the dead see scrolls (4q242) we got Nabonidus prayer saying that an unnamed jewish carismathic forgave his sins and healed his disease. This could be related to Mark chapter 2 when we see Jesus forgiving sins and healing. 1
If I keep in Mind that Jesus answers to the crew that he has authority for forgivness of sins, In John 20 23, when Jesus said to apostles that he was sending them as he was sent by the father and gave them “authority” for the forginess of sins. Then Could be that the christian denominations which has sacrament of confession got it right and we evangelicals not??
I would like to know you opinion on that.
1 Geza Vermes, Early Christian beginnings, page 15.
Professor Hurtado:
Miguel: More precisely, 4Q242 portrays Nabonidus saying that, after appealing to various deities, he then prayed to the Jewish god, and a Jewish exorcist forgave his sins and healed him. So, the exorcist in question is portrayed as acting as the agent of God in answering Nabonidus’ prayers.
To address your final question, yes, I think that there is more room for human agents of divine forgiveness than some Protestant groups allow for.
Having said that if you add that is absolutely necessary to go to a priest, then you would be speaking about your magisterium which is right for catholic. But protestants would see that at odds with the scripture as I do. The problem is no the confession but to say that confession through a man its totally necessary