“Many who became believers confessed their sinful practices” (Acts 19:18 NLT).

An amazing thing began to happen in the city of Ephesus, new believers began to confess their sin and turn from sinful practices. Their faith in Christ led to life-change.
The word “confession” in the New Testament has the literal meaning, “to say the same” (From “homologeo”). So, when we confess our sins to God, we are agreeing with God that we have sinned. It’s not news to Him. He already knows. Confessing our sins, we no longer deny our sinfulness, but agree with God. More than that, confession is a crying out to God for relief from the guilt that pervades the soul as sin’s consequence.
The apostle John wrote, “If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness” (1 John 1:9). Our part is confession. God’s part is not only forgiveness, but also cleansing. So that even sin’s stain might be removed.