As America grows more secular, secularism is increasingly relevant for American political attitudes and behavior. In this article, we contend that secularism-conceptualized as the affirmative embrace of secular belief and identity-is distinct from nonreligiosity, which is simply the absence of religion. We also argue that, at present, secularism is primarily a psychological, and not a social, orientation. Secular belonging and behavior are quite rare and generally unimportant politically, but secular belief and identity are far more prevalent and politically relevant. We examine the relationships that secular belief and identity, secular behavior, and nonreligiosity have with political orientations. Secular belief and identity have a much stronger and more consistent political connection than do secular behavior or nonreligiosity. Then, operationalizing secularism simply as secular belief and identity, we assess its connection to contemporary conspiracy beliefs and to support for democratic values. We find that secularists disavow most conspiracy theories and support the core democratic values of participatory democracy, freedom of expression, and political tolerance. Secularism's connection to political tolerance and support for freedom of expression is quite interesting because it is very different from those of liberal ideology and Democratic partisanship.