Most people, and I'd think some Christians, think of sin as a set of actions.
When we talk about it in public, I think we allow this misapprehension to continue.
Thus the place of 'sin' in the 'economy of salvation' and the whole structure of reality is left untouched both conceptually and explicitly. See Romans 8:19-23.
Sin is not only in our actions, but in our entire disposition towards life, in a corruption of our being as made in God's image: i.e., 'like God' as it is in Genesis 1:27.
Sin results from rejection of God, of repudiation of the fellowship with him we were made for.
So, this is not simple 'moralism' or 'doing the wrong thing'. It is woven into us at a deep level and with that we are cut off from God, the source of life.
Christ: God incarnate in human form, bore the consequence of our rejection in his death, but to not succumb, as we would do. Rather, to defeat it and enable our 'de-separation' from God to come about.
He evidence the defeat of death, the defeat of sin in his resurrection.
From the resurrection flows the offer of new life 'in him'.
This is a complete spiritual re-generation of our inner being, to bring us in to the family of and fellowship with God our Creator.
We are thereby restored to that fundamental life connection and are enabled to be in God's family and know him in Christ, by his indwelling Spirit.
It's not just 'about sin', but by virtue of it, about our separation from God and the path this leads to the natural conclusion of separation: separation devoid of the presence of Christ. Death.