Using data from three surveys of religion in El Salvador from 1988 to 2009, this research looks at changes in the demographic characteristics, religious orientations and practices, and political attitudes of Salvadorans as they transition from civil war to democracy and participation in global capitalism, and from mostly Catholic affiliation to increasing affiliation with Pentecostal Protestant churches. Over the two decades encompassed by the study, the Protestant population has become less clearly differentiated from the Catholic majority in terms of education, income, occupation, and even political beliefs, while remaining distinct in terms of religious beliefs and practices. Unlike much previous research, this study allows for comparisons among practicing and nonpracticing Catholics as well as Protestants and those identifying themselves as unaffiliated.