- (Premise) Humans have intrinsic goods that do not reduce to pleasure.
- (Premise) If there are intrinsic proper functions in humans, probably God exists.
- (Premise) If there are no intrinsic proper functions in humans, either humans have no intrinsic goods or all intrinsic human goods reduce to pleasure.
- Therefore, probably God exists.
Notice that unlike other moral arguments for theism, this one does not necessarily lead to a divine command ethics. The analogue to divine command ethics would be a "designer's purpose" view of proper function. But I think that doesn't give intrinsic proper function.