Globalisation, migration, and (de-)secularisation have fundamentally transformed the concepts of religion, state, and law during the last decades. The main goal of this interdisciplinary approach is to clarify the multifaceted theoretical and practical challenges of religious diversity and socio-political pluralism in Europe. In twenty-two chapters, the contributions to this volume revisit basic concepts, structures and institutional settings such as sovereignty; the dogma of the separation of state, church and/or religion; human and minority rights; gender and religion; varieties of fundamentalisms; interreligious dialogue and peacebuilding; and, not least, religious education.