It is cognitively, and therefore metabolically, less taxing to disbelieve in gods than to believe in them. The cognitive effort needed to "keep straight" the celestial hierarchy, the byzantine code of taboos, commandments, the acrobatics of religious ritual, make it evolutionarily inefficient to believe in supernatural beings. Therefore, we can surmise that evolution favors the more economical use of cognitive metabolism in non-supernaturally inclined organisms. This is why secularism is spreading: evolution is enhancing the reproductive success of non-supernaturalist cognizers. As such, Darwinian natural selection indicates the truth of atheism as the metaphysically simpler explanation.
Now, class, please respond to the above argumentation.