Daniel, seems to me that the faith is best described in relational terms. It is above all the restoration of our relationship with God. The great divide among mankind is between those who know him, or are known by him (love that phrase of Paul’s), and those who don’t. Forgiveness is one aspect of that relationship, as is justification, sanctification, and other terms that describe facets of Christ’s redemptive act. Seems also that the best description centers not merely on what has happened to people in the Way, nor what they do, but what God has done in Christ. This is the central event, the main act, the principle truth.
So my bumper sticker might read: “Christ — where God rights the world.”