Most of us would consider Islam to be a religion, while we would generally view secularism as requiring the limiting of religion to the private sphere. But many scholars (and ideologues) beg to differ. Social scientists are divided over the definitions of religion and secularism, while Islam’s indigenous portrayal of itself as a 'dīn' is not easily translatable into English. This lecture asks both whether Islam might be viewed as an ideology, and whether secularism could be considered a religion.