" ... presupposing biblical creation is no more intractable than presupposing the general theory of evolution."

Oh no? Think back to those two beetles on the Ark, pete. According to you they gave rise to every other species of beetle on the Earth. That means that they must have speciated (i.e. changed into other species of beetle - something that you claim is impossible!)- and all in a few thousand years. So those two beetles, of an unknown species, gave rise to (non-interbreeding) Ladybirds, Dung beetles, Stag beetles, Rove beetles, Devil's coach horses, Whirligig beetles, Ground beetles, Tiger beetles etc., etc., etc. The word "intractable" doesn't even come close! Three other words do spring to mind, though: "perverse", "inconsistent" and "ignorant"!