an icepick through the keyhole

Reason and faith are different ways to look at the universe, analyze it, and relate it to oneself. Reason tends to rely heavily on observation, tests, and linear logic; faith relies more often (though not exclusively) on revelation and intuition.

Neither reason nor faith can tell you whether the world is fundamentally knowable or not. Or rather, either one can tell you either one, but based on utterly different criteria.

The trouble is that there's no possible meta-criteria, no possible meta-analysis, to tell you whether reason or faith is a superior means of looking at and analyzing the universe. You can't judge either of them except in terms of one or the other.