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An Argument from the Regularity of Nature to the Falsity of Metaphysical Naturalism

I find the following argument compelling:

P1. If it is both the case that something has an explanation and that explanation is natural, then it has an explanation that depends on the actuality of the regularity of nature.
P2. If something is contingent, it is not the case that it has an explanation that depends upon the actuality of itself.
P3. All things that are actual are possible.
P4. All things that are possible, and not necessary, are contingent.
P5. All things that are contingent have an explanation.
P6. The regularity of nature is actual.
P7. The regularity of nature is not necessary.
P8. If something has an explanation and it is not the case that the explanation is natural, then metaphysical naturalism is false.
C1. The regularity of nature is possible (from P3 and P6).
C2. The regularity of nature is contingent (from P4, P7, and C1).
C3. The regularity of nature has explanation (from P5 and C2).
C4. It is not the case that the regularity of nature has an explanation that depends upon the actuality of itself (from P2 and C2).
C5. It is not both the case that the regularity of nature has an explanation and that explanation is natural (from P1 and C4).
C6. It is not the case that the explanation of the regularity of nature is natural (from C3 and C5).
C7. Therefore, metaphysical naturalism is false (from P8, C3, and C6).

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