In recent years, a number of religious practices and related topics regarding the integration of immigrants, have been subject to intense political debate. This project asks whether and to what extent states are justified in legally regulating these issues. Addressing both the theoretical and the applied questions involved, it aims to gain insight into the criteria that are decisive for whether a societally relevant issue can legitimately be legally regulated, to determine and explain the limits of legal prohibitions as well as to find answers to current issues of debate such as the ban of the burka.