In several recent writings and in the 1980 Freemantle Lectures at Oxford, Alvin Plantinga has defended the idea that belief in God is ‘properly basic,’ by which he means that it is perfectly rational to hold such a belief without basing it on any other beliefs. The defense falls naturally into two broad parts: a positive argument for the rationality of such beliefs, and a rebuttal of the charge that if such a positive argument ‘succeeds,’ then a parallel argument will ‘succeed’ equally well in showing that belief in the Great Pumpkin is properly basic. (It is taken as obvious that ‘the Great Pumpkin objection,’ unrebutted, would constitute a reductio ad absurdum of the claim that the positive argument had succeeded in proving anything at all.) In this essay I shall argue both that Plantinga has partially misconceived the objection, and that he has not succeeded, indeed cannot succeed, in rebutting it, for the objection does in fact constitute a reductio ad absurdum of his position. For the sake of ease of exposition, I shall first provide a bare sketch of the positive argument, though I shall discuss it directly only as it bears on the attempted reductio.