This Season of Unreason will end with the elections of November 2016, but its consequences – validation of the idea that belief without evidence is a virtue, that religion, and especially Christianity, deserves a place in our politics, our Constitutionally enshrined secularism notwithstanding – will live on and damage the progressive cause. But it does not have to be this way. There will almost certainly be no (declared) atheist or even agnostic among the candidates. This is scandalous, given the electorate’s gradual, relentless ditching of religion. A survey just out shows that 7.5 million Americans have abandoned their faith since...