We study the extent and nature of Christian engagement in morality policy implementation by means of a comparative case study in Germany. In particular, we observe that the nature of engagement varies between unconnected and corresponding types of activities, and we explain this variation with the policy-specific goal congruence between religious organizations (ROs) and the state. Goal congruence, in turn, can be linked to Catholic and Protestant moral doctrines that tell us about ROs' position on morality issues. The study contributes to the literature on faith-based welfare by highlighting the role of moral doctrines as drivers of ROs' social engagement.