In the big Ham on Nye debate, Ham tried – a couple of times – to get Nye on the hook with presuppositional apologetics. These were the times he was asking ‘Could you be wrong about everything you know?’ Nye didn’t take the bait either time, which is good because it means the time was spent more productively. I was going to write a big-ass post all about this line of silliness, but the short video at the bottom pretty well covers everything I would want to say.
There’s two additional points I would make.
Presuppositional apologists try to claim that all truth and logic, the basis of science itself is contingent upon the existence of god. This is their presupposition and they try to claim that people they’re arguing with have their own, equally egregious, presuppositions.
This isn’t true.
Logic, reason, science all come from observation and measurement and the time-tested accuracy and utility of that methodology. It is more correct to say that reason follows post-supposition. We test a thing to see if it is true and then apply it. If it doesn’t work, we discard or revise it and try again. We don’t even presuppose that these results are going to be consistent, which is why we have peer review, repeat experimentation and so on. This is not circular, because these methods produce knowledge which can then be used. If we were wrong about radioactive decay, smoke alarms wouldn’t work. If we were wrong about the lifting effect of wings, planes couldn’t fly and so forth.
The Christian presuppositional argument (and it is usually Christian) can also be applied to other deities, ‘real’ or imagined and even to the universe itself without the need to invoke supernaturalism at all. Whatever stance you take it would follow that whatever the source of logic, reason and science (natural laws) would be, it should be demonstrable via those same natural laws. Can we evidence a god via that method? No. Is it then reasonable to assume that such exists? No. (Incidentally, I’ve seen Muslims try to use this argument too, so right there we have a conflict).
Presuppositional apologetics is just another, dishonest, semantic word game. Just as with William Lane Craig’s version of the Kalam Cosmological argument and as such should probably, at best, be pointed and laughed at.