Theology encompasses metaphysics the way that the necessary concrete actuality of God encompasses and outpasses the mere abstract intellectual conception of God as that than which nothing greater may be conceived. Anselm’s Argument is where abstract metaphysical ratiocination entails the Act of a Being whose actuality makes metaphysics possible, ergo necessary.
Only if God exists actually can metaphysics be possible conceptually. Or, ergo, mathematics, or its application in physics.
The Moderns who insist that metaphysics is dead or impossible or obsolescent all argue from the basis of a metaphysical presupposition – a prejudice, and no more – that there is no God. If there is no God, then they are right. But if there is no God, nor therefore any metaphysics, then neither is there anything else, either; including materialist metaphysics, that boasts to abjure metaphysics altogether.
You can’t get any of the beings that are less than the most real being if you don’t first have the most real being. Take a set of beings; one of them is most real, the others all relatively less real. If the most real being is not real at all, then all the less real beings are even less real than “not real at all.” And the only way to be less real than what is not real at all, is to be in the first place inconceivable.
Theology, then, is the science of all science, the science in virtue of which any other science can know anything. If God is not actual, nothing else can be; if God is not intelligible, and knowable (at least in part, and in principle), then nor can anything else be either knowable or intelligible.
Wonder suffuses the practice of all science – drudgery, too, of course, but the drudgery is motivated by the wonder, which is the engine at the base of the whole project. Appropriately, it is at the far sublime edge of theology that science reaches the limit and culmination of wonder: worship.