What happens if I think I believe in evolution?
by Randy Everist
Suppose one considers a subset of his own beliefs: 1. God exists. 2. The Bible precludes theistic evolution. Now let’s further suppose that he holds (1) with a strength of .9 probability (that is, he is quite sure, if not 100% certain, that God exists) and holds (2) at .7 (that is, he is reasonably sure of its truth, though less so than ). Now this gentleman comes to believe, through arguments and evidence (whether good arguments and evidence are involved will be irrelevant in this case), this claim: 3. Evolution is true.
These truths are actually in tension; if (3) is true, then it is not the case that both (1) and (2) are true, provided a further claim: 4. The Bible is not mistaken with respect to (2). Now beliefs (1-4) form a contradictory set. If all four statements are correct, then whatever accounts for evolution is not theistic; but if nontheistic evolution is true, then God had nothing whatsoever to do with the origin of life (otherwise, it just would be a particular form of theistic evolution). In that case, arguably, God does not exist. So, the man in question should jettison (1), correct? Not at all.
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Suppose the man holds (3) at .8, and he holds (4) at .9. In that case, he believes most strongly that God exists and that the Bible is not mistaken in its teachings concerning evolution and creation. But notice what the man holds to be the least plausible: the claim that the Bible precludes theistic evolution. In this particular case, he ought to give up his particular interpretation of the passage, and thus hold (1, 3, and 4). Or perhaps he, upon re-evaluation, comes to doubt (3) itself, so that evolution is the belief dropped.
My point is that even if evolution comes to be believed by the Christian, he need not jettison his belief in God. This is not merely pragmatic: there are very good reasons to hold that God exists (arguments for his existence, for example). It wouldn’t do to suggest that “evolution is true” is a defeater for the kalam cosmological argument, or moral arguments for God’s existence. Nor would evolution’s truth count against the strength with which the man held the other beliefs (that is, the ones that are compatible). Instead, other considerations ought to be brought to bear…