What role did religion play in the medieval societies of the East?

For the medieval East, religion was something akin to a fundamental structure. Society in the East at that time thought precisely in religious categories. The supreme ruler there, as a rule, was considered almost God. The social structure in some states of the East was also determined by religious norms. For example, the same castes and varnas that determined the position of a person in India. At the same time, religion also established norms of behavior in society, which in general influenced the development of the country, on which its well-being depended.