God is not dealing with us in reference to sin - the cross finished that. On the cross Jesus took away all the sins of all people for all time. He took away all sins - past, present, and future (John 1:29). Our sins are all forgiven and taken away (lifted off of me). The punishment due to humanity for sin was taken by Christ - our death He died - so there is no punishment left for us.
When we sin it changes nothing in our relationship with God. We don't go out of fellowship or stop being "right" with God or need to try to get forgiven. The sin is already dealt with and we are forgiven people at all times. We're right with God forever because of Jesus; that won't change no matter what we do. That means that even in the midst of our worst sin, God is looking on us with a smile and delighting in us! He's already taken care of that sin completely at the cross (Jesus' work is FINISHED) so it isn't on His mind; what's on His mind is His love for us and His joy in the new creation He made us in Christ!
Thus sin can never come between us and God. All guilt and shame and condemnation are removed; if we feel any of that, it is not from God. At the cross all sins were forgiven and God is not counting the sins of the world against them. Sin, being taken away at the cross, is not longer an issue between us and God. God is not pointing out what's wrong with us; He's pointing out what's right with us because of Christ! God doesn't see our sins. He sees us in Christ as holy new creations with Christ's righteous life inside!