Given the need for a multidimensional approach to religious commitment, this study uses a new Bayesian cohort analysis to study data from the United States, Holland, and Japan. After tests of the secularization thesis, this study's findings indicate that secularization cannot be viewed as a "global phenomenon" of modern societies and suggest that the thesis is derived from generational difference factors and often from domestic sociohistorical events. Bahr's traditional model was partially supported for the United States, where aging has a slight effect on church attendance. A similar trend was found for Holland for religious affiliation. The aging process in Japan has a significant effect on religious belief.