This paper by Stefan Bolea really gets the synapse firing. I don’t agree with the underlying premise (in our own image) but the philosophical exercise that flows from considering it is refreshing.
So, Feuerbach is the source of the ‘man created God in his own image‘ phrase: never has a man been so oft repeated without anyone having known his name!
Those who enjoy the highbrow wit of Nietzsche (you sick bastards) can find a lesser known work by him, titled ‘Gay Science’, referenced here as well.