In religion, the prehistoric influences, especially those of the megalithic periods were still quite strong. Beliefs at that time were focused on worship of the spirit of the ancestors which was symbolized in the form of temples which was called pyramid terraces or terraced buildings. Sometimes at the top of the building a menhir was placed, i.e. a monolith column as the symbol of their ancestor's spirit.

During the Hindu period, menhir could be seen in the construction of the temples which looked similar to the terraced pundan. Belief in the gods of the mountains, the sea etc, originated from the period before the arrival of Hinduism, was still reflected in the lives of people after the Hindu religion came in. At the beginning and during the period of King Sri Wijaya Mahadewi, the religion practiced is not mentioned.
We know only the names of the priests who bore the name Siwa, such as Piwakangsita Siwa, biksu Siwanirmala and biksu Siwaprajna.

Based on that, the religion that developed at the time was the Siwa religion. Only during the period of King Udayana and his queen, there were two large religions practiced by the people, i.e. the Siwa religion and the Buddha religion. This information was obtained from the charters which mentioned mpungku Sewasogata (Siwa-Buddha) as the king's assistant