Why don't most Protestants consider confession to be a sacrament?

Most Protestants recognise only two sacraments, saying something like this (from the Anglican 39 Articles): > There are two sacraments ordained of Christ our Lord in the Gospel, > that is to say, Baptism, and the Supper of the Lord But in the Gospels it is written: John 20:21-23 > Again Jesus said, “Peace be with you! As the Father has sent me, I am > sending you.” And with that he breathed on them and said, “Receive the > Holy Spirit. If you forgive anyone’s sins, their sins are forgiven; if > you do not forgive them, they are not forgiven.” > Mt 16,18-20 > And I tell you that you are Peter, and on this rock I will build my > church, and the gates of Hades will not overcome it. I will give > you the keys of the kingdom of heaven; whatever you bind on earth will > be bound in heaven, and whatever you loose on earth will be > loosed in heaven.” > Mt 18,18 > "Truly I say to you, whatever you bind on earth shall have been bound > in heaven; and whatever you loose on earth shall have been loosed in > heaven. For who tells that was introduced by Pope Innocent III: Acts 19,18 > Some believers, too, came forward to admit in detail how they had used > spells > John 1,1:9 > If we confess our sins, he is faithful and just and will forgive us > our sins and purify us from all unrighteousness. > 2 Corinthians 5,18 > All this is from God, who reconciled us to himself through Christ and > gave us the ministry of reconciliation Why isn't confession/penance considered a sacrament by most Protestants? Why don't they think these verses institute the sacrament of confession?