[Teuthida]

I don't think he was trying to group them into one singular catagory but rather use the two merely as an example in questioning those who blindly believe in their religion. I suppose you could make the case that an atheist could be classified as such too, but then you would be getting the inverse of how a Godhead believer (to not just call them "religious people" since you feel atheists are such, though in fact they are the antithesis of what the ture definition of a religious person is) would try to prove their point. If an agnostic isn't sure that God exists or not, wouldn't it be logical that he too would ask a Christian the same questions an atheist would? If perhaps to simply gain a better understanding as to why they believe in such?