Breathing air that “doesn’t exist”

Imagine a person who . . . argues ‘no air exists’ but continues to breathe air while he argues. Now intellectually, atheists continue to breathe — they continue to use reason and draw scientific conclusions [which assumes an orderly universe], to make moral judgments [which assumes absolute values] — but the atheistic view of things would in theory make such ‘breathing’ impossible. They are breathing God’s air all the time they are arguing against him.

―Greg L. Bahnsen