This study asks how religious change at the social level (as expressed in increased religiosity) influences the religious behavior of public organizations. The study's empirical foundation is three Israeli case studies that focus on the impact of growing religiosity in Israeli Jewish society on three large public institutions: the military, healthcare, and schools. Based on comparative analysis of the three case studies, it is shown that variation in the extent of religionization in public organizations is influenced primarily by the religious composition of workers and consumers of a specific public organization. The influence of political pressure from above, however, is marginal. In addition, this study demonstrates how organizational religionization is differentially mediated by institutional mechanisms/structures: institutional layering or conversion.