Devotional movements refers to various forms of Hinduism in India that co-exist with differing doctrines and practices. The history of worship in India is one of hybridisation. In ancient times various regions each had their own local myths and folklore, worshipping their own collection of local spirits and deities. Repeated invasions from the north as well as a vast expansion of trade with the west such as Siraf and with China to the east, brought increased contact with other cultures. India prospered through trade beginning in the days of the Roman Empire. An indicator of the Indian merchants' importance in Siraf comes from records describing dining plates reserved for them. Over time a process of cultural accommodation occurred and the local pantheons of spirits were merged with the foreign. The origin of the major Hindu deities, Vishnu, Shiva, and the various forms of the female consorts or goddess such as Shakti and Durga and the history of their possible converging or merging is not reliably documented. It is likely that in this way, for example, Vishnu collected his long list of Avatars or bodily manifestations. This accounts for the wide range in their divine powers and their rich and contradictory personalities.
The history of devotional movements is as ancient as that of the worship of the significant deities. While Hinduism is often described as having 30,000 gods in its pantheon, from an anthropological and historical perspective the most significant devotional movements of the past two thousand years have centered on only a few. But together with these significant gods are thousands of gods arising from ancient customs and beliefs. There are household gods, village gods, gods of the forests and mountains, agricultural gods, and regional deities. The movements of some of these deities are as ancient as those of the primary gods, and the devotees of these deities often have intertwined histories and practices.
In trying to account for the large number of Pandyan rock-cut temples built between 650 and 835 A.D. art historian K.V.Soundara Rajan attributes this proliferation to the "insistent demand of cult groups".