Ron Rosenbaum makes it clear by his third sentence here that he simply does not know anything about his chosen subject matter:
[Agnosticism] is radical skepticism, doubt in the possibility of certainty, opposition to the unwarranted certainties that atheism and theism offer.
I count three incorrect definitional statements and one false presupposition - four errors, in a mere 20 words. And all stated with a self-certitude that, given Rosenbaum's overarching thesis, should count as a fifth. Impressive.
(Via 3 Quarks Daily.)