Is God an invention?

If neurons were capable of introspection and world-representation, would they have developed an idea of "Brain" (i.e., of God)? Would they have become aware that they are mere intertwined components of a larger whole? Would they have considered themselves agents of the Brain - or its masters? When a neuron fires, is it instructed to do so by the Brain or is the Brain an emergent phenomenon, the combined and rather accidental outcome of millions of individual neural actions and pathways?