The analysis of the religions of Tamilakam should be started from Sangam Age. Though there is no indication of established religion in the Sangam literature, there are plenty of data on established worship patterns. Researchers explain the changes in the social institutions according to the manufacturing relationship. When the social institutions get into changes, the tradition of religious culture too changes accordingly in support of them. As for as Tamil society is concerned, in every age, i.e., from the age of ethnic groups to feudal society, lots of political, economic religious, philosophical and cultural changes have occurred. This paper analyses the interruptions and impacts in the religious cultural tier of Tamils and the specific changes occurred as a result.