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Shiavault - a Vault of Shia Islamic Books The Relationship Between Philosophy and Theology in the Postmodern Age Supplement 3 Wittgenstein's doctrine of language games also has attracted theologians who sought a response to the positivists' charge that religious claims were meaningless.
Although the verificationist theory of meaning advocated by the positivists has been generally rejected, the Wittgensteinian slogan, "meaning is use," provided theologians with a basis in the philosophy of language for turning their attention to functionalist theories of religious language which seemed to dovetail rather neatly with the anti-reductionism popular in Protestant theological circles.
These theologians felt that any attempt to base religious claims on theoretical reason (as in the traditional proofs for the existence of God, called natural theology), or on practical reason (as in Kant's theology), ought to be rejected as reductions of religious claims to metaphysics or ethics, reductions which failed to appreciate the fundamental originality of the religious view, what Schleiennacher (1768-1834) called the religious moment of experience.
These tendencies among many (although by no means all) of those who have been attracted to functionalist explanations of religious language are largely anti-philosophical tendencies, even when they turn to the philosophy of the later Wittgenstein for support. Although there are many disagreements among those who find themselves supporting some variety of fideism, there is agreement among the fideists that religion does not need any philosophical explanation or justification.
So, after our tour through the philosophical territories bordering on theology, we find ourselves back where we started, at epistemology and the question of the rationality of religious belief, for functionalist approaches to religious language, including theories according to which religious language serves to express attitudes rather than to describe reality, are often attempts to escape rational criticism of religious beliefs.
No justification is needed, the fideist proclaims, because the language of religion is independent of and irrelevant to the language of justification. Here the reformed epistemology of Alvin Plantinga, or the related ideas of William Alston may be seen as a sort of compromise between those who would justify religious claims by rational proof and those who deny that any such justification is needed or desirable.