Simple, when we die the capacity to sin dies, hence we are free, in the literal sense.
Rom 6:6 knowing this, that our old man is crucified with Him in order that the body of sin might be destroyed, that from now on we should not serve sin.
Rom 6:7 For he who died has been justified from sin.
Rom 6:8 But if we died with Christ, we believe that we shall also live with Him,
Rom 6:9 knowing that when Christ was raised from the dead, He dies no more; death no longer has dominion over Him.
Rom 6:10 For in that He died, He died to sin once; but in that He lives, He lives to God.
Rom 6:11 Likewise count yourselves also to be truly dead to sin, but alive to God through Jesus Christ our Lord.
In context, as used as a baptism text, the old man is crucified, buried and stands up in newness with Christ. Yet we know, even after baptism, baptism in the Spirit or re-birth, we can still sin so it has to mean more. The way I am seeing it now is that sin exists in spite all these things, when the focus is off sin and on the Father. Alive to God though Jesus Christ our Lord, embracing His teachings and example, we have access to the Father in spite of our sins.
Sin has no dominion over us unless we give it life, hence we determine how big a part sin plays in our life.
Rom 6:14 For sin shall not have dominion over you, for you are not under Law, but under grace.
The Grace of God far outweighs any sin we may commit. Love covers a multitude of sin, nothing we do separates us from the Love of God.