It has been well said that if the triangles had a god, they would give it three sides.
--Montesquieu, Lettres Persanes, LIX
Others have said it, before and after. Ludwig Feuerbach, the left Hegelian and precursor of Marx, in The Essence of Christianity (1841), sought to demonstrate that man created God in his own image, as a culmination of human self-alienation. At the other end of the scale, Xenophanes in the 6th-5th Century BC said that
The Ethiopians say that their gods are snub-nosed and black,
the Thracians that theirs have gray eyes and red hair.
[As reported in Clement of Alexandria, Miscellanies, 7, 22].
To my taste, Montesquieu’s form (or the form reported by Montesquieu) is the most elegant and economical. It makes clear that we define God in terms of what defines as creatures who define God.