"Therefore, confess your sins to one another..." - James 5:16
It helps when you give the full context.
The Prayer of Faith
Jas 5:13 Is any among you afflicted?
let him pray. Is any merry?
let him sing psalms.
Jas 5:14 Is any sick among you?
let him call for the elders of the church; and let them pray over him, anointing him with oil
in the name of the Lord:
Jas 5:15 And the prayer of faith shall save the sick, and
the Lord shall raise him up; and if he have committed sins, they shall be forgiven him.
Jas 5:16 Confess your faults one to another, and pray one for another, that
ye may be healed. The effectual fervent prayer of a
righteous man availeth much.
Jas 5:17 Elias was a man subject to like passions as we are, and
he prayed earnestly that it might not rain: and it rained not on the earth by the space of three years and six months.
Jas 5:18 And
he prayed again, and the heaven gave rain, and the earth brought forth her fruit.
Jas 5:19 Brethren, if any of
you do err from the truth, and
one convert him;
Jas 5:20 Let
him know, that
he which converteth the sinner from the error of his way shall save a soul from death, and shall hide a multitude of sins.
Notice where I highlighted everything as being singular in the actions of just one person as it doesn't say the Catholic or even the Protestant Church, but that each one of us as an individual that has faith in God comes to Him on our own accord as we hear the Lord calling us to Him. It is God who heals us and it's only through God drawing us to Him that we confess to God alone of our sins and only God can forgive us our sin and save us. It's all about the Father, Son and Holy Spirit that Spiritually guides us and protects us from the evil principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places. Even Jesus himself could not go above or add to and take away from what God gave Him to speak. Faith comes by hearing the word of God, not man's word. Why can we not all believe that which has already been written by the Prophets and Apostles.
John 12:49 For I have not spoken of myself; but the Father which sent me, he gave me a commandment, what I should say, and what I should speak.
John 12:50 And I know that his commandment is life everlasting: whatsoever I speak therefore, even as the Father said unto me, so I speak.
I get so fed up with the war between Catholic and Protestants of who is right or who is wrong. It's not about any mans religion with their doctrines, by-laws and creeds of their four walled church with a name attached to it as it has always been about our faith within the Trinity of being God, Jesus and the Holy Spirit. It's about our very soul in relationship to all three as salvation comes by no other then Christ Jesus and all Spiritual teaching comes only by the Holy Spirit.
Jesus is the rock of my salvation and the gates of hell can not prevail against the rock that is our very foundation of faith.
Psalms 62:1 To the chief Musician, to Jeduthun, A Psalm of David. Truly my soul waiteth upon God: from him cometh my salvation.
Psalms 62:2 He only is my rock and my salvation; he is my defence; I shall not be greatly moved.