Every religion has a core of mandatory rules for the faithful. Not simply indicate to whom and how to pray, but often also establish modes of dress and food, days of work and rest: they regulate, in short, many aspects of everyday life, including some (apparently) very far of today in the West mean by religion. The problem of religious right, long ignored, has now reached today due to the multicultural and multireligious character of contemporary society: you can not understand or control the tensions caused by the coexistence of different religions, without knowing the regulatory apparatus that guides the life of the faithful. This book examines comparative legal systems of three religions Judaism, Christianity, Islam and investigating their common roots, their points of contact and contrast, the distance that separates them from the laws of the States. It is an important contribution to knowledge and comparison of different religious laws, which will help us better understand the dynamics underlying the sometimes disturbing implication of religion, politics and society, and suggest a response to certain critical points which, though it seemed resolved forever, have jumped back to more pressing today. Interested in right of religion, theology, sociology of religion, intercultural, interreligious dialogue, cultural mediation, cultural policies.