The new atheists, as opposed to an older generation of atheists, love to portray themselves as skeptics. But they should be careful. It is true that words like skeptic have a narrow meaning in the sense of referring to doubt about a specific claim only. That's fine: language is a living, changing thing, and words can drift in various ways, such as narrowing and broadening. But skepticism (call it capital-S skepticism) has not lost its earlier radical meaning of universal principled doubt : the literal inability to know anything at all or anything about a particular matter. Atheists who defend reason ought to make clear that this is not what they embrace. After all, if we can't know, then what's the point of asking a believer for evidence of God's reality? What is evidence to a capital-S skeptic? It's an illusion. If in principle we cannot know, then evidence is a bogus category. There can be no such thing! Anyone's claim -- even a theist's -- is as good a...