The story of the decline of religion in America is incomplete. What has gone less noticed, and less studied, is the rise of ersatz religions in America—secular substitutes for traditional forms of faith. The fastest-growing of these pseudo-religions occupy either end of the political spectrum, and are themselves explicitly political. They are also dangerous cults with almost no redeeming qualities, and if left unchecked will inspire their adherents to commit violence. In some cases, they already have.