
That’s actually quite good.
Indeed, that is the Catholic teaching, as well. Several of our rites clearly state they are Jesus’ actions, not those of the priest (who, properly speaking, is not a mediator). The “necessity” of the rite and sacrament stems from our human nature. We are both body and spirit; both are necessary parts of our humanity. We are not primarily bodies which have the circumstance of being ensouled. Nor are we primarily spiritual beings imprisoned in bodies.
Since we are body-spirits, it is inadequate to address us on one element of existence only. That is why God came to us bodily in the person of Jesus. That is why God gave us sacraments. He did that so we can experience Him in His fullness.