The article argues that the study of western democracies benefits from a conceptualisation of Christian churches as societal veto players characterised by three features: their power, which depends on their potential for mobilisation; their preferences, which can be deduced from churches' official statements and which are often outside the political spectrum; and their coherence, which determines the size of their indifference curve. Conceptualised as societal veto players, churches can be included in actor-centred theories of policy-making. Particular attention should be paid to veto points, church-state relations and religious parties, as these are the features of the political system that affect churches' behaviours. A comparative study of churches' roles in stem-cell policies illustrates the use of the concept. The study shows that the Catholic Church is a 'stronger' veto player than protestant churches, but that this stronger role can have paradoxical effects on the resulting policies and the policy process.
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