This article contributes to the debates about nineteenth- and twentieth-century working-class religiosity and about the nature, timing and extent of secularisation. After defining ‘popular religion’ and identifying its key components in the context of the Black Country from 1914 to 1965, its decline during the last thirty years of the period is analysed, using extensive oral evidence, in terms of four principal factors: the effects of war; an increasing emphasis on the private nuclear family and changing attitudes to children; the disappearance of older working-class neighbourhoods and communities; and greater prosperity and the availability of secular leisure facilities.