Full Idea
How can you prove the unity of a Deity? A great number of men join in building a house or ship, in rearing a city; why may not several deities combine in contriving and framing a world?
Gist of Idea
Design cannot prove a unified Deity. Many men make a city, so why not many gods for a world?
Source
David Hume (Dialogues Concerning Natural Religion [1751], Part 5)
Book Reference
'The Existence of God', ed/tr. Hick,John [Macmillan 1964], p.106
A Reaction
You might look at the Cistine Chapel ceiling and conclude that only a team could have achieve such a thing. Since there is no way to infer how many gods might be involved, then one god is a possible theory.