Hitting the moral mark is challenging, while missing it is easy. This is, in part, because there are far more possible false beliefs than true ones, and false beliefs can lead to significant moral error. Moreover, a foundational belief is particularly critical in this regard. As Aristotle notes, A small error at the outset can lead to great errors in the final conclusion (De Caelo et Mundo 271b8-13). Thus, the following argument occurs to me:If belief in God is foundational to moral reasoning among theists and not true, then theists frequently miss the moral mark when compared to atheists or agnostics (premise).Belief in God is foundational to moral reasoning among theists (premise).Theists do not frequently miss the moral mark when compared to atheists or agnostics (premise).Thus it is not the case that both God is foundational to moral reasoning among theists and not true (1,3 Modus Tollens).Thus, it is not the case that belief in God is not true (2,4 Conjunctive Syllogism).Therefore, belief in God is true (5 Double Negation).