The religious dimension is one of the important variables that shape the human personality - individuals and groups - and its valuable, intellectual and emotional system, and play a key role in guiding its behaviour, work, continuity and relationships. While many studies have addressed the realities of Muslims in Europe and the challenges they face in the legal, economic and political aspects, few may draw attention to the importance of the intellectual religious dimension and the impact of certain religious concepts on the formation of Muslim personality and the building of their relations. The book that we have here is one of these few books, which is a specialist in Islamic studies, between academic abuse and personal experience generated by its extended involvement in European life and its complication of the problems of Muslim communities in Europe in general and Germany in particular; it is precisely this vacuum that this book seeks to fill, with examples of religious concepts that are most present in Europe and that have an impact on Muslims.