Historical Angkor was more than a site for religious art and architecture. It was the site of vast cities that served all the needs of the Khmer people. Aside from a few old bridges, however, all of the remaining monuments are religious edifices. In Angkorian times, all non-religious buildings, including the residence of the king himself, were constructed of perishable materials, such as wood, "because only the gods had a right to residences made of stone." Similarly, the vast majority of the surviving stone inscriptions are about the religious foundations of kings and other potentates. As a result, it is easier to write the history of Angkorian state religion than it is to write that of just about any other aspect of Angkorian society.
Several religious movements contributed to the historical development of religion at Angkor:
Indigenous religious cults, including those centered on worship of the ancestors and of the lingam;
A royal cult of personality, identifying the king with the deity, characteristic not only of Angkor, but of other Indic civilizations in southeast Asia, such as Champa and Java;
Hinduism, especially Shaivism, the form of Hinduism focussed on the worship of Shiva and the lingam as the symbol of Shiva, but also Vaishnavism, the form of Hinduism focussed on the worship of Vishnu;
Buddhism, in both its Mahayana and Theravada varieties.
Pre-Angkorian religion
The religion of pre-Angkorian Cambodia, known to the Chinese as Funan (1st century AD to ca. 550) and Chenla (ca. 550 - ca. 800 AD), included elements of Hinduism, Buddhism and indigenous ancestor cults.
Temples from the period of Chenla bear stone inscriptions, in both Sanskrit and Khmer, naming both Hindu and local ancestral deities, with Shiva supreme among the former. The cult of Harihara was prominent; Buddhism was not, because, as reported by the Chinese pilgrim Yi
