Romans 8 deals with sin - but forgiveness is never mentioned. Forgiveness of sins was taught in Romans 1-5. Forgiveness was found in Justification.
After forgiveness was found in Christ - Romans 8 describes a more complete blessing.
Freedom from the Adamic Nature. Deliverance from the root of sin. No longer controlled by the flesh. Carnality taken away. Possessed totally by the Indwelling Spirit. Righteousness of the Law "fulfilled". A completed work of the Spirit - after forgiveness was found earlier in the Christian life.
Read Romans 8 and see for yourself. Confession not mentioned. Forgiveness not mentioned. Sin mentioned but freedom and deliverance from sin taught.