I think he would be a compassionate individual, good by my standards, even if he did not believe in God. Lizard's exchange with Walter Lee got me thinking again about morality and ice cream, and I realized, at last, that the two statements are not equivalent. The speaker would be proposing the consensual adoption by all members of the group of a rulebook which would greatly streamline the conduct of a meeting, saving everyone valuable time and energy. Morality is a rulebook, or rather a scheme of competing rulebooks proposed because they advance utilitarian goals. There is another, overlapping theory of morality which is not inconsistent with the first.
Morality is a beautiful and appealing system.
The beautiful survives and persists whether or not it is also useful. Moreover, it is both beautiful and useful whether or not you back it up with the idea of God. Statements about morality describe a preference for a beautiful and useful system governing our interactions with other people. Finally, my correspondent's criticism, that in a world without God any preference for morality only describes a transient appetite, does not say exactly what it appears to say. If you are committed to the overwhelming importance of truth, you cannot follow him down this road.