Propitiation resolves the problem of the demands of God’s righteousness and justice. He is always propitiated so that those demands are always met for all time and eternity, therefore our sins, even post-salvation sins, are no longer an issue.
(But we still need to confess them to stay in fellowship with God. 1 Jn 1:9)
Our sins do not jump off us when we confess them, for they were already paid for "once for all time". But Christ is justified, who has forgiven us , to cleanse us from all sin. This is the way I believe it, so I don't get tangled up by those who say you will go to Hell if you die having any unconfessed sin in your life (a form of legalism).
No, the key is Ephesian where Paul says God "In Love He Predestined us". He predestined us before the foundation of the world, before we were even born. Not because of any merit that we would ever have, but simply because He Loved us, because He Loved us, Because He Loved us.
This is why I always mention God's Love first. It is out Love that He went to the Cross, it is out of Love that He paid the full price to meet the Father's demands. It is out of Love that He Justifies us and out of Love that he Preserves us and is the Finisher of our Faith.
Best Regards,
SR
Salvation and fellowship are two different things here. You can be saved and out of fellowship with God.