The existence of Ken Ham proves that creationism changes, therefore proving that it is not absolute, inerrant truth as he claims, therefore Ken Ham disproves creationism. QED. We can all go home now.

By the way, that’s not a bad diagram for illustrating the relationships of the various versions of creationism, except that the pedigree breaks down for Intelligent Design creationism, which is kind of a weird syncretic hodge-podge that accommodates both of the major branches of the creationist tree. It really ought to be shown as the warped, evil offspring of an unnatural act, an orgy of all of the critters in the bestiary. And then it also lies about its parentage (as would we all, if we sprang from such mindless chaos).