Barth begins with the assertion of dogmatics as a theological discipline, and theology as a function of the church. This is immediately followed by the confession of the church through the church's speaking of God.
These three sentences are fundamentally different from the manner in which most people think about theology. I say most people, because there are enough both outside and inside the church who think that we can't talk about God at all, or that it's an empty concept. Inside the church, (and, I suppose, outside as well) there are enough who see theology as a function of the academy.
Barth is not only disagreeing with those views, he's doing so in a place where he has to presuppose some of the things that are normally "proven" here - the existence of God, the ability to engage in God-speak, the scientific nature of theology. Barth wants to argue that theology is unique only in that it turns to the specific task which other sciences could have, but never actually have, done. Christian philosophy, he notes, could have done the job, but when it was Christian, it wasn't philosophy, and when it was philosophy, it wasn't Christian. The scientific theology turns to the critique and correction of God-speech by the measure of the Church's own principle. We need it because no other discipline does it, and we need it because it as a discipline, at the end of things, does only this.
Other sciences, other disciplines, could still do the job. The highest point of each discipline could be in this task - and we need neither to bemoan nor justify that it is not; it is not, and the vacuum that this creates cannot be endured. Theology is a discipline of need, because we can't do without this task, and the other disciplines have failed to carry it out. This is an interesting view of theology and the sciences - not quite the "queen of the sciences" in the way that some of us might secretly hope for, but certainly the queen in that the master of it has a connection to every other discipline; as someone recently said to me "you theologians have to know a little bit about everything to make anything in your discipline make sense to the real world."
This really seems to be the case. The ivory tower theologian can't be a real theologian, because we have to not only live in the world, but give an account to the Church. We can't disconnect our task from other disciplines, because our task is tied up in the human-ness of humanity. As Luther long before,
vera theologia practia est. That's not to say it is "practical theology", the academic distinction, rather, that because it is a function of the Church, it has to have connection to our life and our life of faith. We remove ourselves from the common human experience if we don't keep this connection alive, and that removal prevents theology, and dogmatics, from carrying out the very task on which it lives.
Alberto Coffa said, "A fool-proof
method to transform something obvious into something unbelievable is
to ask a philosopher to explain it to you." We dare not do this as theologians, nor as Christians. It doesn't help a bit to get to point D if you can't get someone else from A there, through B and C.
Barth also notes some good reasons to keep the idea of theology as a science, but cautions that even if theology calls itself a science, it is in no way obligated to hold to the standards that the other sciences have for themselves. Theology can relate to the other disciplines, but must understand herself as a science of necessity, something there to fill the gaps when we can't endure their presence. And yet, theology may be more a science than anything else which goes by that name, for it also must say what it is that is to be understood under the term "science", and when this is a matter of human knowledge, it becomes a matter of how humans rightly speak about the things that are objectively true.
One of the reasons Barth gives for calling theology a science is to remind us that it's human effort, and to show solidarity with the other human efforts of knowledge. Thus, we aren't raising theology up to be the equal of other sciences, we are admitting that the human effort involved in it forces a condescension to the level of the other sciences. We must be reminded of the inescapable profanity (as in, non-sacredness) in trying to carry out the task of theology.
A last interesting point is that Barth notes that it can't hurt the university to have theology under the same roof as the other sciences, to remind everyone that traditions are traditions next to other traditions (and to remind the Church that Aristotle is not her originator!). This reminds me of some of the discussion on the role of theology in the public university, that was in JAAR last year. It's a fact of life in Germany, though some might like to change it. I think that it doesn't hurt to have it there, but I see how it would be really problematic to be 100% fair. Well, as long as I'm a part of the majority who gets the benefit, I can enjoy it, right?