The Book on Changing Dynamics of Freedom of Right to Religion under Indian Constitution: A Judicial Analysis is an attempt to analyze the freedom of religion under constitution through the lence of judiciary as India is a land of many religions but it is a secular state. India is not an anti religion state. Out of Eight Major religious in the world, four have their origin in India. The constitution of India has accepted the principles of secularism. Secularism in India means that the religion will not play any part in the public affairs of the country. Religion is one of the important social institutions. Religion refers to the most sublime of human aspirations.It is a part of human social life. It shapes human behaviour in a major fashion. Religion is a system of belief in the existence of supernatural beings. Constitution plays important role to protect religion. In this regard sense of Articles 25 and 26 is not limited to matters of doctrine of belief. It extends also to acts done in pursuance of ‘religion’ and, therefore, contains a guarantee for rituals and observances, ceremonies and modes of worship which are integral part of religion.