God's primary saving actions are celebrated in the ritual action of the sacraments. Not if we mean by causes that grace is unavailable without the sacraments. We cannot say that and say at the same time that we believe in Jesus Christ. The Incarnation is full and final. God is present to human beings.
Sacraments are intense moments in that sanctification.
For a larger and more detailed discussion of this material see Richard P. McBrien. Completely Revised and Updated .