["Journal for the Scientific Study of Religion, Volume 60, Issue 2, Page 332-361, June 2021. ", "\nAbstract\nResearchers are increasingly identifying a number of elements of the “dark side” of religion that undermine its overall positive relationship with well‐being. This study assesses the impact of changes in religious doubt for physical health and depression in emerging adulthood, a life course stage when individuals begin to form their own religious identity. Using Waves 3 and 4 of the National Study of Youth and Religion, a latent class growth analysis was used to derive four trajectories of religious doubt (stable no doubt, stable doubt, increasing doubt, decreasing doubt). Regression results suggest that those in the increasing doubt class reported higher depression and worse self‐rated health than with stable no doubt. Causal mediation analyses revealed that a decreased sense of meaning in life was found to mediate this relationship. This study sets forth implications for future research centered on religion and health over the life course.\n"]