Examining his statements carefully, here's my restatement. He'll have to tell me if I'm off the mark or not.
Jody cares because he wants liturgy to matter.
He says that the liturgy matters because we are material beings who worship. Worship requires a grammar because it communicates meaning. This grammar is not meaningless, but communicates the values of its culture--the church, the family of God. The church is the family that God has called into being, he says, and it is the subsequent sacrament of the first sacrament, Christ.
This grammar isn’t concerned with what things are. It is a passive sentence that tells the story of an active God. It is concerned with what things are for. In the performance of its grammar the community confesses God’s acts and interprets what they mean to itself. Misconfessing this at the very least spoils the message and at most is blasphemous!
The words and prayers of the church are traditions that affect real change. Blessing is a way the grammar sets something apart to be what it is for. Ordination is a way the grammar sets someone apart to play a role in the corporate performance. And there is also a reordering of the thing's identity, where identity is ontologically dependent upon use.
In baptism and ordination, this ontological change is called an indelible mark, which changes the individual to reorient them toward Christ. It doesn't mean they are super-people, but it is a testimony to the activity of the Holy Spirit.
The Spirit and the incarnation make all of this more than a (Wittgensteinian) parlor game. The incarnation, because matter is rightfully part of the divine plan. It is useful and necessary. The Spirit, because it affects creation of world and word and so gives direction and structure to the community itself. (This last paragraph is a muddled mess of theological gobbledygook.)
At this point, Jody gestures toward "the power of language to reorient and redefine." We're both boxing at Wittgenstein's speech-acts now.
At any rate, I think he’s hearing me say that liturgy does not matter. That’s not what I’m saying. I’m saying that the liturgy is a family custom, and like all family customs, it occasionally does things that are a little crazy--but that’s okay.
I'll add more to this post--this is just half-written. It is a draft to get something out there.