Fewer Americans are identifying as Christians and more have no religious affiliation. How will secular Americans transform politics? Ryan Burge tracks the decline in mainline protestants and the rise of Americans with no particular religious identity. He says they are part of a broader anti-institutional trend in American life, with only atheists and agnostics sticking out as the political subset. John C. Green finds a rise in avowed secularists who are motivated by politics and changing the face of the Democratic party. But these secularists don’t represent everyone who lacks a tie to organized religion.