An additional 30,000 (numbers may vary) (primarily ethnic Vietnamese) live in the United States, Europe, and Australia. Hinduism Adherence to Hinduism in Vietnam is associated with the Cham ethnic minority; the first religion of the Champa kingdom was a form of Shaivite Hinduism, brought by sea from India. The Cham people erected Hindu temples (Bimong) throughout Central Vietnam, many of which are still in use today; the now-abandoned Mỹ Sơn, a UNESCO World Heritage Site, is perhaps the most well-known of Cham temple complexes. Approximately 50,000 ethnic Cham in the south-central coastal area practice a devotional form of Hinduism. Most of the Cham Hindus belong to the Nagavamshi Kshatriya caste, but a considerable minority are Brahmins. Another 4,000 Hindus (mostly Tamil, and otherwise of Cham or mixed Indian-Vietnamese descent) live in Ho Chi Minh City, where the Mariamman Temple acts as a focal point for the community. In Ninh Thuận Province, where most of the Cham in Vietnam reside, Cham Balamon (Hindu Cham) numbers 32,000; out of the 22 villages in Ninh Thuận, 15 are Hindu. As per the census of 2009, there are a total of 56,427 Cham Hindus in Vietnam. Out of this number, 40,695 are in Ninh Thuận, and another 15,094 are in Bình Thuận. Islam Much like Hinduism, adherence to Islam in Vietnam is primarily associated with the Cham ethnic minority, although there is also a Muslim population of mixed ethnic origins, also known as Cham, or Cham Muslims, in the southwest (Mekong Delta) of the country. Islam is assumed to have come to Vietnam much after its arrival in China during the Tang Dynasty (618–907), through contact with Arab traders. The number of followers began to increase as contacts with Sultanate of Malacca broadened in the wake of the 1471 collapse of the Champa Kingdom, but Islam would not become widespread among the Cham until the mid-17th century. In the mid-19th century, many Muslim Chams emigrated from Cambodia, settling in the Mekong Delta and further bolstering the presence of Islam in Vietnam. Vietnamese Muslims remained relatively isolated from the mainstream of world Islam, and their isolation, combined with the lack of religious schools, caused the practice of Islam in Vietnam to become syncretic. Although the Chams follow a localised adaptation of Islamic theology, they consider themselves Muslims. However, they pray only on Fridays and celebrate Ramadan for only three days. Circumcision is performed not physically