Does God exist apart from human awareness, perception, conception and language? Is God causally efficacious in the universe? Is it possible to be justified in believing that God is at work in nature?
In order to make progress on these questions, we must distinguish between a natural theology and a theology of nature. A Lutheran natural theology claims that natural events and states somehow strongly justify belief in God. A Lutheran theology of nature, on the other hand, asserts that natural events and states merely weakly justify belief in God. It is important, obviously, to distinguish weak and strong justification.
Proposition P is strongly justified for S just in case it would be irrational for S not to believe P. On the other hand, proposition P is weakly justified for S just in cane it would not be irrational for S to believe P. A Lutheran theology of nature must claim that assertions of God's relationship to the universe are weakly justified, in other words, that it is not irrational for S to believe that God is at work in the universe. In the flight to avoid a natural theology, Lutheran theology has omitted that which is essential to it: A Lutheran theology of nature. While a Lutheran theology of nature is not interested in proving the existence of God (strong justification), it is vitally concerned to show the compatibility of God's existence with nature (weak justification).
In carrying out a Lutheran theology of nature, semantic realism is presupposed, a realism that allows for the "evidence-transcending truth-conditions" of theological language. Presumably, 'God is real' is not a publicly verifiable statement. Therefore, many philosophers have said that the statement is not just false, but meaningless. Without getting into technical detail here, however, we must assert that ontological statements of this type can be meaningfully asserted even if they are not confirmable or infirmable in experience. (I leave aside for now all of the issues that surround this last phrase.)
What is important is that we not understand 'God exists' merely as 1) a report or expression of one's subjective psychological or existential states, 2) as an undecipherable metaphor for the mystery of life itself or a quality of life itself, 3) or finally, as a linguistic custom one uses in belonging to a tribe of language-users who use such locutions at particular communal/tribal times or places.
To do a Lutheran theology of nature presupposes a beginning in revelation, a beginning that takes seriously the scriptural witness to a real God that causally affects the world by 1) creating and sustaining it, 2) electing and protecting God's chosen people, 3) and sustaining all of His people through God's real historical incursion in the resurrection and subsequent witness to that resurrection. It must take seriously the salient fact that Scripture thoroughly rejects a causally inert, causally impotent deity. Simply put, it must seriously engage the question that if Scripture is to be regarded as a trustworthy witness, then there must be warrant for the claim that God is real, that God has causal powers, and that God is more than mere idea.
The cosmological, ontological and teleological arguments for the existence of God are not successful in demonstrating the existence of the divine. However, if they are properly understood, they are effective in showing that it is not irrational to believe that God exists. In other words, while they cannot show that it is irrational not to believe God exists, they can show that it is not irrational to believe that God exists. Clearly, the Book of Nature can be interpreted either as having a globally-designing deity or as not having one. At issue here is the retrieval of the doctrine of divine providence. A Lutheran theology of nature can claim that a providential God is weakly justified on the basis of Scripture and experience.
Applying Bayes Theorem to the universe and the question of intelligent design cannot make God's existence probable, but clearly such application can show that God's existence is more probable than it might have been if the universe did not have the characteristics it seems to have. Even though the existence of God may not be in itself likely, on the supposition of God's existence, one would very much expect more a universe like ours rather than on the supposition of God's nonexistence.
A Lutheran theology of nature makes explicit reference to God as acting in and through nature. Obviously, the discussion between science and theology is important in developing a Lutheran theology of nature. Because a theology of nature is important for the future of Lutheran confessional theology, the discussion between science and theology is important for the future of Lutheran theology. Accordingly, Lutheran theology must reject the causal closure of the physical and assert the real existence of God. It must claim that there are natural events that are not finally wholly caused by congeries of other natural events. Finally, it must examine the nature of that which could serve as a causal joint connecting the divine to the universe.
To claim that God is real is to admit one fundamental dualism: the dualism between the divine and the natural universe. Thus, there is a realm of natural entities, properties, relations, events and states of affairs that does not include the divine. There is also a realm of divine entities, properties, relations, events and states of affairs the does not include the natural order. Lutheran theological realism simply cannot hide from this dualism.
In order to have a coherent view, Lutheran theology must seek to relate talk of God to the discourses of the sciences. Not to do this is finally to assign theology to the realm of value; it is to make theology subjective and ultimately irrational.
The cash value of this view for piety is apparent. After all, people in the pews have for generations prayed to God, assuming that God is different than the self and that God can act in the world. Theological realism best undergirds this practice. Such people have thought that God is active in the world, that God creates, redeems, and sustains the world, and that God answers prayer. Again, theological realism best undergrids this practice. Clearly, a Lutheran theology of nature must presuppose theological realism.
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