Within the depth-psychology corpus, ‘religiousness’ is treated not as a settled category but as a contested, multidimensional construct whose boundaries, functions, and clinical significance remain actively debated. Pargament’s foundational work foregrounds the distinction between intrinsic and extrinsic religiousness — inherited from Allport — as the dominant psychological framework, while simultaneously demonstrating its insufficiency: the poles of means and ends cannot be cleanly separated, and religiousness as measured often yields mixed, context-dependent outcomes. Alongside this theoretical tension sits an empirical one: religiousness sometimes moderates the effects of stress on mortality and well-being, yet in other studies it shows no significant relationship to adjustment outcomes whatsoever. The Benda-McGovern volume shifts the frame to applied clinical research, where religiousness is distinguished from spirituality by its behavioral, social, doctrinal, and denominational specificity — a definition drawn from the Fetzer Institute — and evaluated as a protective factor in addiction treatment and recovery. Laudet and colleagues extend this further, testing religiousness as one node in a network of social, spiritual, and meaning-based resources affecting quality of life among recovering persons. Across these positions, a key tension persists: whether religiousness is most usefully understood as an independent protective variable, a cultural orientation, or a proxy for deeper spiritual experience.