This essay traces the development of a consensus against belief as a category relevant to the study of ancient religion, taking Roman religion as a case in point. The anti-belief position began with Christian disparagement of traditional worship and continued with late-20th-century cultural relativism. After dismantling arguments that belief is unique to western cultures, I introduce the cognitive theory of intentionality. On this theory, all mental states represent or are about objects and circumstances in the world. I distinguish two broad mental state types: the practical, such as desire, which represents circumstances as we would have them be, and the doxastic, such as belief, which represents circumstances as we take them to be. Insofa...