What Is Real Knowledge?

In my regular (though somewhat less frequent of late) perusal of internet blogs, I often find myself confronted with the smug attitudes of theists who not only think they have all the answers, but they know it with a level of certainty that gives them license (they suppose) to talk down to those who are skeptical of their "knowledge", and treat them with disdain, as if they are not only lacking in understanding, but willfully so, and thus deserving of incivility.  The expression of this attitude may be manifested as a stubborn refusal to give any consideration to what the skeptic has to say, or open hostility, including all the hatred and scorn that the theist wishes to heap upon the hapless skeptic.

This smug, cocksure attitude can be found in the Old Testament:

The fool says in his heart, “There is no God.” (Psalm 14:1)