Kebatinan, also called Kejawen, Agama Jawa and Kepercayaan is a Javanese religious tradition, consisting of an amalgam of animistic, Buddhist, Hindu and Islamic, especially Sufi, beliefs and practices. It is rooted in the Javanese history and religiosity, syncretizing aspects of different religions.
The term kebatinan is being used interchangeably with kejawen,Agama Jawa and Kepercayaan, although they are not exactly the same:
Kebatinan is the inner-directed cultivation of inner peace, rooted in pre-Islamic traditions, whereas kejawen is outer-directed and community-oriented, manifesting in rituals and practices.
Java has been a melting pot of religions and cultures, which has created a broad range of religious belief, including animism, spirit cults, and cosmology.
Indian influences came first with Hinduism, which reached the Indonesian Archipelago as early as first century. In the 4th century, the kingdom of Kutai in East Kalimantan, Tarumanagara in West Java, and Holing (Kalingga) in Central Java, were among the early Hindu states established in the region. Several notable ancient Indonesian Hindu kingdoms are Mataram, famous for the construction of the majestic Prambanan temple, followed by Kediri and Singhasari. Since then Hinduism along with Buddhism spread across the archipelago and reached the peak of its influence in the 14th century. The last and largest among Hindu-Buddhist Javanese empires, Majapahit, influenced the Indonesian archipelago.