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Theism and Explanation - Appeared-to-Blogly

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146 <strong>Theism</strong> <strong>and</strong> <strong>Explanation</strong><br />

characterise an adequate explanation. But this is a very modest position.<br />

After all, none of the features I have discussed—testability, consistency with<br />

background knowledge, simplicity, on<strong>to</strong>logical economy, <strong>and</strong> informativeness—rule<br />

out proposed theistic explanations a priori. A proposed theistic<br />

explanation formulated with the requisite degree of intentional specifi city<br />

would be testable (7.1.1). Whether it survives the test is another question,<br />

but it is not a question which we can decide in advance. Consistency with<br />

background knowledge is a contingent matter: if we already had a tradition<br />

of successful theistic explanations, then there would be no reason <strong>to</strong> reject<br />

yet another. On<strong>to</strong>logical economy is a ceteris paribus condition. It suggests<br />

that we should not posit new kinds of entities unless these are required <strong>and</strong><br />

it is at least conceivable that positing a divine agent might be required, <strong>to</strong><br />

explain some phenomenon. And while a proposed theistic explanation may<br />

not be a “lovely explanation,” which would allow us <strong>to</strong> deduce the precise<br />

details of the effect, this does not seem (by itself) a fatal objection, if it were<br />

<strong>to</strong> score highly on our other criteria.<br />

So yes, my arguments might give us reason <strong>to</strong> prefer natural explanations<br />

when these are available, <strong>and</strong> <strong>to</strong> seek natural explanations when they<br />

are not. It follows that a proposed theistic explanation should be, at best,<br />

an explanation of last resort. 2 One might argue that this view—that we<br />

should ab<strong>and</strong>on the search for natural explanations only in extremis—<br />

represents a kind of “presumption of naturalism.” And so it does. But my<br />

point is that such a presumption would be (in principle) defeasible. And it<br />

falls short of what most people mean by the “methodological naturalism”<br />

of the sciences.<br />

My own view is that the naturalistic research tradition of the sciences<br />

has been stunningly successful <strong>and</strong> must rank as of one of the greatest of<br />

human achievements. But I think it is poorly served by attempts <strong>to</strong> defi ne<br />

science in such a way as <strong>to</strong> exclude the supernatural. The debate over intelligent<br />

design is instructive in this regard. One might win a legal vic<strong>to</strong>ry<br />

by insisting that this proposed theistic explanation is not what we cus<strong>to</strong>marily<br />

call “science.” And this is true, for contingent his<strong>to</strong>rical reasons.<br />

But it would be much more effective <strong>to</strong> show that this particular proposed<br />

theistic explanation, with its deliberately vague appeal <strong>to</strong> an unspecifi ed<br />

“designer,” is practically vacuous. It lacks the fi rst <strong>and</strong> most important virtue<br />

of any proposed explanation, namely that of testability. It follows that<br />

this particular proposed theistic explanation should be rejected.<br />

Could the theist produce a better one? I doubt it, but then it would be<br />

most regrettable if we were <strong>to</strong> forbid him <strong>to</strong> try. Nothing could be more<br />

antithetical <strong>to</strong> the spirit of free enquiry than this kind of censorship. If proposed<br />

theistic explanations are <strong>to</strong> be defeated, as they have been so often<br />

in the past, it will be by way of the free contest of ideas. The contribution<br />

which I hope this study has made is <strong>to</strong> show how this could be done, by<br />

outlining the st<strong>and</strong>ards against which any proposed theistic explanation<br />

should be measured.

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