Globally there is high morbidity due to mental illnesses, necessitating research on positive mental health and new models of mental health promotion. This study investigates the mediating role of spirituality to known pathways between childhood social exposures and adult mental health outcomes—hope, meaning in life and depression among young Kenyan men. Using the “religion as attachment” framework, we investigate whether childhood attachment conditions predict lower scores of daily spiritual experiences, and whether this pathway mediates associations between childhood attachment conditions and current depression, meaning in life, and hope. Spirituality significantly mediated associations between childhood attachments and adult mental health.