Maybe the growth of "God" signifies the existence of God. That is: if history naturally pushes people toward moral improvement, toward moral growth, and their God, as they conceive their God, grows accordingly, becoming morally richer, then maybe this growth is evidence of some higher purpose, and maybe — conceivably — the source of that purpose is worthy of the name divinity.

The Evolution of God. New York: Little, Brown and Company, 2009, p. 286.