So there are theists, the believers, who believe that a God exists and have faith in His plan and His will.
There are atheists, who do not believe that any God exists, and therefore have no faith in any divine will or plan.
There are agnostics, who do not feel justified coming to a decision as to the existence or nonexistence of a God, and generally feel similarly about said God’s will and/or plan.
There are apathetics, who do not give a crap either way.
There are combinations of the above terms to describe the many possible subtleties that exist within the spectrum of beliefs held among all humans.
So my question is: what kind of terminology would best describe the Winchesters, who have almost definitive proof that God (and angels, demons, Lucifer, etc.) exist but also have absolutely zero faith in His plan/will?