The U.S. government estimates the total population at 16.9 million (midyear 2020 estimate). According to the MCR, approximately 95 percent of the population is Buddhist, of whom 95 percent practice Theravada Buddhism. The remaining 5 percent of the population includes Christians, Muslims, animists, Baha’is, Jews, and Cao Dai adherents. Ethnic Vietnamese traditionally practice Mahayana Buddhism, although many have adopted Theravada Buddhism. Other ethnic Vietnamese practice Roman Catholicism, and these make up the vast majority of Catholics in the country. Catholics constitute 0.4 percent of the population. Nongovernmental estimates of the Protestant population, including evangelical Christians, vary but are less than 2 percent of the total population.

According to government estimates, approximately 2.1 percent of the population is Muslim, although some nongovernmental organizations (NGOs) estimate Muslims constitute 4 to 5 percent of the population. The Muslim population is predominantly ethnic Cham, although not all Cham are Muslim. The Cham typically live in towns and rural fishing villages on the banks of the Tonle Sap Lake and the Mekong River, as well as in Kampot Province. There are four main Islamic traditions represented in the country. Nearly 90 percent of Muslims are adherents to Sunni Islam, subscribing to the Shafi’i school of Islamic law. The remaining minority practice Salafist, Wahhabist, and Ahmadi doctrines. A portion of the Cham community also subscribes to the indigenous Iman-San sect of Islam, combining traditional ancestral practices with Sunni Islam.

An estimated 0.28 percent of the population is ethnic Phnong, the majority of whom follow animistic religious practices. An additional estimated 0.25 percent of the population includes Baha’is, Jews, and Cao Dai adherents.

The U.S. government estimates the total population at 267 million (midyear 2020 estimate). According to the 2010 census, approximately 87 percent of the population is Muslim, 7 percent Protestant, 3 percent Roman Catholic, and 1.5 percent Hindu. Those identifying with other religious groups, including Buddhism, traditional indigenous religions, Confucianism, Gafatar, other Christian denominations, and those who did not respond to the census question, comprise approximately 1.3 percent of the population.

The Muslim population is overwhelmingly Sunni. An estimated one to five million Muslims are Shia. Many smaller Muslim groups exist; estimates put the total number of Ahmadi Muslims at 200,000 to 400,000.

Many religious groups incorporate elements of Islam, Hinduism, and Buddhism, making it difficult to disaggregate the exact number of followers. An estimated 20 million persons, primarily in Java, Kalimantan, and Papua, practice various traditional belief systems, often referred to collectively as aliran kepercayaan. There are approximately 400 different aliran kepercayaan communities throughout the archipelago.

The Sikh population is estimated between 10,000 and 15,000, with approximately 5,000 in Medan and the rest in Jakarta. There are very small Jewish communities in Jakarta, Manado, Jayapura, and elsewhere, with the total number of Jews estimated at 200. The Baha’i Faith and Falun Dafa (or Falun Gong) communities report thousands of members, but independent estimates are not available. The number of atheists is also unknown, but the group Indonesian Atheists states it has more than 1,700 members.

The province of Bali is predominantly Hindu, and the provinces of Papua, West Papua, East Nusa Tenggara, and North Sulawesi are predominantly Christian.

The U.S. government estimates the total population at 109.2 million (midyear 2020 estimate). According to the 2015 census (the most recent) conducted by the Philippine Statistics Authority (PSA), 79.5 percent of the population is Roman Catholic and 9 percent belong to other Christian groups, including Seventh-day Adventists, United Church of Christ in the Philippines (UCCP), United Methodists, Episcopal Church in the Philippines, Bible Baptist Church, other Protestant churches, Jehovah’s Witnesses, and The Church of Jesus Christ of Latter-day Saints. Other Christian groups include locally established churches, such as the Iglesia ni Cristo (Church of Christ); Philippine Independent Church (Aglipayan or IFI); Members Church of God International; The Kingdom of Jesus Christ; and The Name above Every Name. Approximately 6 percent of the population is Muslim, according to the PSA, while the NCMF estimates a figure of 10 to 11 percent. The NCMF attributes its higher estimate to a number of factors, including the reluctance of Muslims to officially register with the civil registrar office or to participate in the formal survey; the community’s transience due to internal movement for work; and the government’s failure to survey Muslim areas and communities thoroughly. According to the PSA, approximately 4 percent of those surveyed in the 2015 census did not report a religious affiliation or belonged to other faiths, such as animism or indigenous syncretic faiths.

A majority of Muslims are members of various ethnic minority groups and reside in Mindanao and nearby islands in the south. Muslims constitute a majority in the BARMM. Although most are practitioners of Sunni Islam, a small minority of Shia Muslims live in the provinces of Lanao del Sur and Zamboanga del Sur in Mindanao. An increasing number of Muslims are migrating to the urban centers of Manila, Baguio, Dumaguete, Cagayan de Oro, Iligan, Cotabato, and Davao, a trend that accelerated after the May-October 2017 siege of Marawi during which local residents fled to other provinces for their security.

The U.S. government estimates the country’s total population at 69.0 million (midyear 2020 estimate). The 2010 population census, the most recent available, indicated 93 percent of the population is Theravada Buddhist and 5 percent Muslim. NGOs, academics, and religious groups state that 85 to 95 percent of the population is Theravada Buddhist and 5 to 10 percent Muslim. Other groups, including animists, Christians, Confucians, Hindus, Jews, Sikhs, and Taoists, constitute the remainder of the population.

Most Buddhists incorporate Hindu and animist practices into their worship. The Buddhist clergy (sangha) consists of two main schools of Theravada Buddhism: Mahanikaya and Dhammayuttika. The former is older and more prevalent within the monastic community.

Islam is the dominant religion in three of the four southernmost provinces (Narathiwat, Yala, and Pattani) near the Malaysian border, commonly referred to as the Deep South. The majority of Muslims in those provinces are ethnic Malay, but the Muslim population nationwide also includes descendants of immigrants from South Asia, China, Cambodia, and Indonesia, as well as ethnic Thai. Statistics provided by the Religious Affairs Department (RAD) of the Ministry of Culture indicate that 99 percent of Muslims are Sunni.

The majority of ethnic Chinese and Vietnamese practice either Mahayana or Theravada Buddhism. Many ethnic Chinese, as well as members of the Mien hill tribe, also practice forms of Taoism.

The majority of Christians are ethnic Chinese, and more than half of the Christian community is Roman Catholic.

The U.S. government estimates the total population at 98.7 million (midyear 2020 estimate). The government’s 2019 National Population and Housing Census reported approximately 13 million religious adherents, accounting for 14 percent of the total population. The census noted Catholics represented the largest number of adherents, with six million followers, accounting for 45 percent of the total number of believers nationwide and six percent of the overall population. The census recorded Buddhists as the second largest religious group, accounting for five million followers or 35 percent of the total number of religious adherents nationwide and five percent of the overall population. Protestants were the third largest group with nearly one million followers, accounting for seven percent of the total number of believers nationwide and one percent of the overall population. The census results contrast with January 2018 statistics released by the GCRA in which 26 percent of the population is categorized as religious believers participating in registered activities, with 15 percent of the population Buddhist, seven percent Roman Catholic, two percent Hoa Hao Buddhist, one percent Cao Dai, and one percent Protestant. GCRA officials, however, also estimate 90 percent of the population follows some sort of faith tradition, registered or otherwise. According to observers, many religious adherents choose not to make their religious affiliation public for fear of adverse consequences, resulting in substantial discrepancies among various estimates.

According to government statistics, the total number of religious adherents reportedly decreased by roughly 2.5 million and the ratio of religious adherents dropped from more than 18 percent to 14 percent of the total population between the 2009 and 2019 censuses. Catholics and Protestants saw increases in membership, while Buddhists and religious groups based on local traditions saw a declining number of adherents, according to census data. Anecdotal reporting from provincial Vietnam Buddhist Sangha (VBS), Catholic, and Protestant leaders, however, indicates membership in all religious traditions continues to grow.

According to census data, VBS membership decreased from more than nearly seven million in 2009 to approximately five million in 2019. The GCRA estimates that the number of Buddhist followers is more than 10 million. The VBS notes that this number only counts those officially registered to sanghas (community of monks and nuns) and does not account for potentially tens of millions of others who believe in and observe Buddhist practices to various degrees without formal participation in a registered Buddhist religious group.

Within the Buddhist community, Mahayana Buddhism is the dominant affiliation of the Kinh (Viet) ethnic majority, while approximately 1 percent of the total population, almost all from the ethnic minority Khmer group, practices Theravada Buddhism.

Smaller religious groups combined constitute less than 0.16 percent of the population and include Hindus (mostly an estimated 70,000 ethnic Cham in the south-central coastal area); approximately 80,000 Muslims scattered throughout the country (approximately 40 percent are Sunnis; the remaining 60 percent practice Bani Islam); an estimated 3,000 members of the Baha’i Faith; and approximately 1,000 members of The Church of Jesus Christ of Latter-day Saints (Church of Jesus Christ). Religious groups originating in the country (Buu Son Ky Huong, Tu An Hieu Nghia, Minh Su Dao, Minh Ly Dao, Tinh Do Cu Si Phat Hoi, and Phat Giao Hieu Nghia Ta Lon) comprise a total of 0.34 percent of the population. A small, mostly foreign, Jewish population resides in Hanoi and Ho Chi Minh City. National statistics on religious adherents from the GCRA and the Vietnam Fatherland Front are considered less comprehensive, as they do not account for members of unregistered religious groups.

Other individuals have no religious affiliation or practice animism or the veneration of ancestors, tutelary and protective saints, national heroes, or local, respected persons. Many individuals blend traditional practices with religious teachings, particularly Buddhism and Christianity. Research institutions, including the Vietnam Academy of Social Sciences, estimate there are approximately 100 “new religions,” mostly in the North and Central Highlands.

Ethnic minorities constitute approximately 14 percent of the population. Based on adherents’ estimates, two-thirds of Protestants are members of ethnic minorities, including groups in the Northwest Highlands (H’mong, Dzao, Thai, and others) and in the Central Highlands (Ede, Jarai, Sedang, and M’nong, among others). The Khmer Krom ethnic group overwhelmingly practices Theravada Buddhism.