Since I love reminding positive atheists that every philosophy is predicated on at least one axiom, and thus rests on a foundation of "faith" in the general sense of the word. Usually I reference Euclids axiom that through any two points one and only one straight line can be drawn, or the faith we have in the scientific methods ability to reproduce the same results under the same conditions. Both these principles are so obvious they require no proof, which is fortunate, since none, to date, has been found.