The majority of Vietnamese do not follow any organised religion, though many of them observe some form of Vietnamese folk religion. Confucianism as a system of social and ethical philosophy still has certain influences in modern Vietnam. Mahāyāna is the dominant branch of Buddhism, while Theravāda is practised mostly by the Khmer minority. About 8 to 9% of the population is Christian—made up of Roman Catholics and Protestants. Catholicism was introduced to Vietnam in the 16th century and was firmly established by Jesuits missionaries (mainly Portuguese and Italian) in the 17th centuries from nearby Portuguese Macau. French missionaries (from the Paris Foreign Missions Society) together with Spanish missionaries (from the Dominican Order of the neighbouring Spanish East Indies) actively sought converts in the 18th, 19th, and first half of the 20th century. A significant number of Vietnamese people, especially in the South, are also adherents of two indigenous religions of syncretic Caodaism and quasi-Buddhist Hoahaoism. Protestantism was only recently spread by American and Canadian missionaries in the 20th century; the largest Protestant denomination is the Evangelical Church of Vietnam. Around 770,000 of the country's Protestants are members of ethnic minorities, particularly the highland Montagnards and Hmong people. Although it is one of the country's minority religions, Protestantism is the fastest-growing religion in Vietnam, expanding at a rate of 600% in recent decades. Several other minority faiths exist in Vietnam, these include: Bani, Sunni and non-denominational sections of Islam which is  practised primarily among the ethnic Cham minority. There are also a few Kinh adherents of Islam, other minority adherents of Baha'i, as well as Hindus among the Cham's.