In the entire Old-and-New-Testaments RSV translation of The Holy Bible, the word confess is found only in the following VERY-few passages:

Leviticus 5:5 When a man is guilty in any of these, he shall confess the sin he has committed
Leviticus 16:21 and Aaron shall lay both his hands upon the head of the live goat, and confess over him all the iniquities of the people of Israel, and all their transgressions, all their sins; and he shall put them upon the head of the goat, and send him away into the wilderness by the hand of a man who is in readiness.
Leviticus 26:40 But if they confess their iniquity and the iniquity of their fathers in their treachery which they committed against me, and also in walking contrary to me
Numbers 5:7 he shall confess his sin which he has committed; and he shall make full restitution for his wrong, adding a fifth to it, and giving it to him to whom he did the wrong.

Psalm 32:5 I acknowledged my sin to you, and I did not hide my iniquity; I said, "I will confess my transgressions to the LORD"; then you did forgive the guilt of my sin.
Psalm 38:18 I confess my iniquity, I am sorry for my sin.

Isaiah 48:1 Hear this, house of Jacob, who are called by the name of Israel, and who came forth from the loins of Judah; who swear by the name of the LORD, and "confess" the God of Israel, but not in truth or right.

Ezekiel 12:16 But I will let a few of them escape from the sword, from famine and pestilence, that they may confess all their abominations among the nations where they go, and may know that I am the LORD."

John 9:22 His parents said this because they feared the Jews, for the Jews had already agreed that if any one should "confess" Him to be Christ, he was to be put out of the synagogue.
John 12:42 Nevertheless many even of the authorities believed in Him, but for fear of the Pharisees they did not "confess" it, lest they should be put out of the synagogue
Romans 10:9 because, if you "confess" with your lips that Jesus is Lord and believe in your heart that God raised Him from the dead, you will be saved.
Philippians 2:11 and every tongue "confess" that Jesus Christ is Lord, to the glory of God the Father.
First Timothy 3:16 Great indeed, we "confess," is the mystery of our religion: He was manifested in the flesh, vindicated in the Spirit, seen by angels, preached among the nations, believed on in the world, taken up in glory.
James 5:16 Therefore confess your sins to one another, and pray for one another, that you may be healed. The prayer of a righteous man has great power in its effects.
First John 1:9 If we confess our sins, He [not "she" - including the virgin Mary] is faithful and just, and will forgive our sins and cleanse us from all unrighteousness.

First John 4:3 and every spirit which does not "confess" Jesus is not of God. This is the spirit of antichrist, of which you heard that it was coming, and now it is in the world already.
Revelation 3:5 He who conquers shall be clad thus in white garments, and I will not blot his name out of the book of life; I will "confess" his name before my Father and before his angels.

ONLY the verses highlighted in black above relate to confession related to sins, whereas the other imply simply acknowledgment of loyalty or allegiance.

Precious few indeed!

And notice that the very first time the word "confess" is found, it is in the Torah book of Leviticus - not before that!

NONE in Genesis. NONE even in Exodus!

Below are ALL the verse in the entire Old-and-New-Testament RSV Bible translation containing the word confession:

Ezra 10:1 While Ezra prayed and made confession [for or about what?], weeping and throwing himself down before the house of God, a very great assembly of men, women, and children, gathered to him out of Israel; for the people wept bitterly.
Ezra 10:11 Now then make confession to the LORD the God of your fathers, and do his will; separate yourselves from the peoples of the land and from the foreign wives."

Nehemiah 9:3 And they stood up in their place and read from the book of the law of the LORD their God for a fourth of the day; for another fourth of it they made confession [for or about what?] and worshiped the LORD their God.

Daniel 9:4 I prayed to the LORD my God and made confession, saying, "Oh Lord, the great and terrible God, who keeps covenant and continual love with those who love Him and keep His commandments,
Daniel 9:5 we have sinned and done wrong and acted wickedly and rebelled, turning aside from your commandments and ordinances;
Daniel 9:6 we have not listened to your servants the prophets, who spoke in your name to our kings, our princes, and our fathers, and to all the people of the land.

"Confession" again implies mere acknowledgment or allegiance or testimony (not directly pertaining to declaring sins but instead professing doctrinal beliefs):

First Timothy 6:12 Fight the good fight of the faith; take hold of the eternal life to which you were called when you made the good "confession" in the presence of many witnesses.
First Timothy 6:13 In the presence of God who gives life to all things, and of Christ Jesus who in his testimony before Pontius Pilate made the good "confession"
Hebrews 3:1 Therefore, holy brethren, who share in a heavenly call, consider Jesus, the apostle and high priest of our "confession."
Hebrews 4:14 Since then we have a great high priest who has passed through the heavens, Jesus, the Son of God, let us hold fast our "confession."
Hebrews 10:23 Let us hold fast the "confession" of our hope without wavering, for He who promised is faithful

Note that there is not one verse in the entire New-Testament in which the word "confession" is associated with the abstraction of sin or sinning! Instead, the word "confession" therein alludes simply to communicating (verbally or whatever) doctrinal beliefs (supposedly to others).

And first occurrences of the word: confessing within the entire RSV Old-and-New-Testament Holy Bible:

Nehemiah 1:6 let thy ear be attentive, and your eyes open, to hear the prayer of your servant which I now pray to you day and night for the people of Israel your servants, confessing the sins of the people of Israel, which we have sinned against you. Yes, I and my father's house have sinned.
Daniel 9:20 While I was speaking and praying, confessing my sin and the sin of my people Israel, and presenting my supplication before the LORD my God for the holy hill of my God;
Matthew 3:6 and they were baptized by him in the river Jordan, confessing their sins.

Remarkable -- considering all the emphasis especially the Catholic, Anglican, Episcopalian, Lutheran and even the Baptists place on confessing sins (to God and/or others)!

Moreover, the first occurrences of the word: sin in The Bible is:

Genesis 4:7 If you do well, will you not be accepted? And if you do not do well, sin is couching at the door; its desire is for you, but you must master it."
Genesis 18:20 Then the LORD said, "Because the outcry against Sodom and Gomorrah is great and their sin is very grave...
Genesis 20:9 Then Abimelech called Abraham, and said to him, "What have you done to us? And how have I sinned against you, that you have brought on me and my kingdom a great sin? You have done to me things that ought not to be done."
Genesis 31:36 Then Jacob became angry, and upbraided Laban; Jacob said to Laban, "What is my offense? What is my sin, that you have hotly pursued me?

Here are the first occurrences of the word: sinner in The Bible is:

Proverbs 11:31 If the righteous is requited on earth, how much more the wicked and the sinner!
Proverbs 13:22 A good man leaves an inheritance to his children's children, but the sinner's wealth is laid up for the righteous.
Proverbs 14:21 He who despises his neighbor is a sinner, but happy is he who is kind to the poor.

The first occurrences of the word: sinners in The Bible:

Genesis 13:13 Now the men of Sodom were wicked, great sinners against the LORD.
First Samuel 15:18 And the LORD sent you on a mission, and said, 'Go, utterly destroy the sinners, the Amalekites, and fight against them until they are consumed.'
Psalm 1:1 Blessed is the man who walks not in the counsel of the wicked, nor stands in the way of sinners, nor sits in the seat of scoffers

And the first occurrences of the word: sinning in The Bible:

Genesis 20:6 Then God said to him in the dream, "Yes, I know that you have done this in the integrity of your heart, and it was I who kept you from sinning against me; therefore I did not let you touch her.
First Samuel 14:33 Then they told Saul, "Behold, the people are sinning against the LORD, by eating with the blood." And he said, "You have dealt treacherously; roll a great stone to me here."

First occurrences of the word: sinned:

Genesis 20:9 Then Abimelech called Abraham, and said to him, "What have you done to us? And how have I sinned against you, that you have brought on me and my kingdom a great sin? You have done to me things that ought not to be done."
Exodus 9:27 Then Pharaoh sent, and called Moses and Aaron, and said to them, "I have sinned this time; the LORD is in the right, and I and my people are in the wrong.
Exodus 9:34 But when Pharaoh saw that the rain and the hail and the thunder had ceased, he sinned yet again, and hardened his heart, he and his servants.
Exodus 10:16 Then Pharaoh called Moses and Aaron in haste, and said, "I have sinned against the LORD your God, and against you.
Exodus 32:30 On the morrow Moses said to the people, "You have sinned a great sin. And now I will go up to the LORD; perhaps I can make atonement for your sin."
Exodus 32:31 So Moses returned to the LORD and said, "Alas, this people have sinned a great sin; they have made for themselves gods of gold.
Exodus 32:33 But the LORD said to Moses, "Whoever has sinned against me, him will I blot out of my book.

The word "sin" is implied in the following (and not in a non-sanitary or menstrual Levitical sense of animals being ceremonially "unclean"):

Isaiah 6:5 And I said: "Woe is me! For I am lost; for I am a man of unclean lips, and I reside in the midst of a people of unclean lips; for my eyes have seen the King, the LORD of hosts!"
Isaiah 64:6 We have all become like one who is unclean, and all our righteous works are like a polluted garment. We all fade like a leaf, and our iniquities, like the wind, take us away.

But, apart from David, Solomon, Daniel, and Isaiah (perhaps a precious few more), where in the entire Bible is ANY record of Eve, Adam, Lamech, Methuselah, Noah, Moses, Aaron, Joshua, Gideon, Samson, Samuel, Jeremiah, Hezekiah, Ezekiel, Hosea, Jonah, Habakkuk, Zachariah, Zechariah, Obadiah, Amos, Malachi, Matthew, Mark, Luke, Andrew, Silas, Jude, etc. EVER mentioning that they had sinned and asked for forgiveness from God? Where are their disgusting? sordid litanies of sin confessions written and found?

And there are several references to "unclean" concerning evil spirits in the New Testament books of Matthew, Luke, and Acts.

The first occurrences of the word: forgive:

Genesis 50:17 'Say to Joseph, Forgive, I implore you, the transgression of your brothers and their sin, because they did evil to you.' And now, we beg you, forgive the transgression of the servants of the God of your father." Joseph wept when they spoke to him.
Exodus 10:17 Now therefore, forgive my sin, I implore you, only this once, and entreat the LORD your God only to remove this death from me."

The word: forgives:

Psalm 103:3 who forgives all your iniquity, who heals all your diseases...
Proverbs 17:9 He who forgives an offense seeks love, but he who repeats a matter alienates a friend.

And the word: forgiveness:

Psalm 130:4 But there is forgiveness with you, that you should be feared.
Daniel 9:9 To the Lord our God belong mercy and forgiveness; because we have rebelled against Him
Matthew 26:28 for this is my blood of the covenant, which is poured out for many for the forgiveness of sins.

That last one seems weird indeed, not only allegorically referencing and/or pseudo-equating wine in a cup with blood, but implying that that bloody wine was poured out (wherever -- on the table or the floor?) then and there at The Last Supper, and that by so pouring (which pouring out or spilling on the table or floor not elaborated upon according to the Biblical account) sins (for what? and of whoever?) were "forgiven."

It is intriguing to see that the aforementioned words: confess, confession, confessing, sin, sinner, sinning, forgive, forgiveness are not mentioned pertaining to Adam and Eve (Cain excluded), nor Lamech, nor Methuselah, nor Noah, nor even Abraham.

It gives insight to the verse:

Romans 4:15 For the law brings wrath, but where there is no law there is no transgression.

But, even though there was no declared "transgression" under Law (which was not given until the time of Moses getting contents of The Torah including the Ten Commandments and other moral and ceremonial laws):

Romans 5:14 Yet death reigned from Adam (don't forget about Eve, THE inferior-gender Sin-Starter!) to Moses, even over those whose sins were not like the transgression of Adam (don't forget about Eve, THE inferior-gender Sin-Starter!), who was a type of the one who was to come.
Romans 5:17 If, because of one human's trespass (don't forget about Eve, THE inferior-gender Sin-Starter!), death reigned through that one human (don't forget about Eve, THE inferior-gender Sin-Starter!), much more will those who receive the abundance of grace and the free gift of righteousness reign in life through the one man (i.e. superior-gender male human) Jesus Christ.

So, instead of merely informing and/or reminding God (and/or others) how sinful we have been (how boastfully proud and/or embarrassed and humiliated we are by so informing and reminding), pompously disclosing to God and bragging to others the titillating, probably defiling, and/or gory details and specifics of how we have sinned . . . a corrective change of mindset and of actual operational behavior is what really matters most, and what both the Lord and others want of and for others and themselves (and not in that sequential ordering).

Concerning that word "themselves" above, we all do (or should) understand that the Triune God (in all Three Persons) is totally and completely forever without sin:

Hebrews 4:15 For we have not a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin.

First Peter 2:22 He [Jesus] committed no sin; no deceit was found on His lips.

But of those who the following is true . . .

Proverbs 28:13 He who conceals his transgressions will not prosper, but he who confesses and forsakes them will obtain mercy.

. . . there is both reconciliation and hope, temporally and eternally!

However, concerning (and not "regarding") those who simply and mindlessly mouth the mantras of corporate or individual sins confessions, but are like the soul-less dog which (not "who") turns back to its (not necessarily "his" or "her") own vomit, and like the washed pig which (not "who") again wallows in the mire (Second Peter 2:22), there is NO forgiveness, NO reconciliation, and NO hope. . . and against (not "for") who the Lord has nothing but relentless rebuke and rejection:

Amos 5:21 "I hate, I despise your feasts, and I take no delight in your solemn assemblies.
22 Even though you offer me your burnt offerings and cereal offerings, I will not accept them, and the peace offerings of your fatted beasts I will not look upon.
23 Take away from me the noise of your songs; to the melody of your harps (and guitars, drums, pipe organs, pianos, etc.) I will not listen.
24 But let justice roll down like waters, and righteousness like an ever-flowing stream.
25 Did you bring to me sacrifices and offerings the forty years in the wilderness, house of Israel?
26 You shall take up Sakkuth your king, and Kaiwan your star-god, your images, which you made for yourselves;
27 therefore I will take you into exile beyond Damascus," says the LORD, whose name is the God of hosts.

Matthew 7:21 "Not every one who says to me, 'Lord, Lord,' shall enter the kingdom of heaven, but he who does the will of my Father who is in heaven."

Luke 6:46 "Why do you call me 'Lord, Lord,' and not do what I tell you?"

First John 3:18 Little children, let us not love in word or speech but in work and in truth.
First John 2:17 And the world passes away, and the lust of it; but he who does the will of God stays around forever.

Revelation 20:12 And I saw the dead, great and small, standing before the throne, and books were opened. Also another book was opened, which is the book of life. And the dead were judged by what was written in the books, by what they had done.
Revelation 20:13 And the sea gave up the dead in it, Death and Hades gave up the dead in them, and all were judged by what they had done.