This article argues that the topos of dialogue between Christians and Marxists fulfilled a key role in the creation and maintenance of power relations in religious politics in East Germany. Three case studies illustrate the topos of dialogue as a strategy of struggle: 1. the campaign against ‘revisionism’ and ‘politicised religion’; 2. the church policy strategy of ‘differentiation’; 3. the critique of the phenomena commonly associated with the Christian–Marxist dialogue outside East Germany in the mid-1960s. These instances of socialist religious politics, while having their own dynamics, were closely related through specific actors and argumentative strategies.