The relevance of Christian liturgy can hardly be underestimated. Christians are present in most of the world’s cultures and societies today. Sometimes they are only tiny minorities. Sometimes these minorities are well respected, but the opposite can be equally true. Sometimes they are suppressed and even persecuted. In other cases Christians occupy a majority position, which enables them to celebrate and live their faith in the public realm. This position, which can but may not necessarily go back several centuries, also allows them to be in power and to staff the decision-making bodies at many levels of socio-economic and political life. Still other historical circumstances cause Christians to look back on an influential past and a lost impact. This often results in a fragmented situation with an uncertain outcome, which obviously comes with many challenges, not least for Christians themselves. This scenario is particularly the case in so-called secular cultures, characterized by sometimes dramatically rapid processes of pluralization and detraditionalization.