The process of European integration is presenting the churches of Europe with new challenges. Applying a combination of social-scientific, historical and theological methods, the author investigates the self-understanding and the Europe concept of Christian and Islamic organizations within European civil society. The study points towards an ecclesiastical concept that enables a combination of fundamental Protestant concerns and societal conditions in Europe.The study received the award Wissenschaftspreis of Hanns-Lilje-Stiftung 2013 (Link).