Religion in Thailand is varied. There is no official state religion in the Thai constitution, which guarantees religious freedom for all Thai citizens, though the king is required by law to be Theravada Buddhist. The main religion practised in Thailand is Buddhism, but there is a strong undercurrent of Hinduism with a class of brahmins having sacerdotal functions. The large Thai Chinese population also practises Chinese folk religions, including Taoism. The Chinese religious movement Yiguandao (Thai: Anuttharatham) spread to Thailand in the 1970s and it has grown so much in recent decades to come into conflict with Buddhism; it is reported that each year 200,000 Thais convert to the religion. Many other people, especially among the Isan ethnic group, practise Tai folk religions. A significant Muslim population, mostly constituted by Thai Malays, is present especially in the southern regions.
According to official census data over 90% of Thais follow Buddhism. However, the religious life of the country is more complex than how it is portrayed by such statistics. Of the large Thai Chinese population, most of those who follow Buddhism have been integrated into the dominant Theravada tradition, with only a negligible minority having retained Chinese Buddhism. Otherwise, a large part of the Thai Chinese have retained the practice of ethnic Chinese religion, including Taoism, Confucianism and Chinese salvationist religions (such as Yiguandao and the Church of Virtue). Despite being practised freely, these religions have no official recognition, and their followers are counted as Theravada Buddhists in statistical studies. Also, many Thai and Isan practise their ethnic Tai folk religion.
Muslims are the second largest religious group in Thailand at 4% to 5% of the population. Thailand's southernmost provinces -- Pattani, Yala, Narathiwat and part of Songkhla and Chumphon -- have large populations of Muslims, consisting of both ethnic Thai and Malay. Christians, mainly Catholics, represent just over 1% of the population. A small but influential community of Sikhs in Thailand and some Hindus, mostly live in the country's cities and are engaged in retail commerce. There is also a small Jewish community in Thailand, dating back to the 17th century.
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According to the 2015 census, 67,328,562 Thailand residents in the different regions of the country belonged to the following religious groups:
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Buddhism in Thailand is largely of the Theravada school. Over 90% of Thailand's population adheres to such school, though Thai Buddhism is practised alongside Chinese indigenous religions by the large Thai Chinese population, and alongside Hinduism by the Thais.
Buddhist temples in Thailand are characterised by tall golden stupas, and the Buddhist architecture of Thailand is similar to that in other Southeast Asian countries, especially Cambodia and Laos, which share a cultural and historical heritage with Thailand.
Many within the large Thai Chinese population practise various Chinese religions, including the worship of local gods, Chinese ancestral worship, Taoism, Confucianism and Chinese salvationist religions. One of the latter, Yiguandao (Thai: Anuttharatham), spread to Thailand since the 1970s, and it has grown so popular to come into conflict with Buddhism; in 2009 there were more than 7000 Yiguandao churches in the country and approximately 200.000 people convert each year into the religion. Despite the large number of followers and temples these religions have no state recognition, their temples are not counted as places of worship, and their followers are counted as "Theravada Buddhists" in officially released religious figures. Chinese temples are called sanchao in Thai language.
The Chinese folk religion of Thailand has developed local features, including the worship of local gods. Major Chinese festivals such as Nian, Zhongqiu, and Qingming, are widely celebrated, especially in Bangkok, Phuket, and other parts of Thailand where there are large Chinese populations.
The Chinese in the city of Phuket practise a nine-day vegetarian festival between September and October. During the festive season, devotees will abstain from meat and mortification of the flesh by Chinese mediums is also commonly seen. The rites and rituals are devoted to the veneration of Tua Pek Kong. Such traditions were developed during the 19th century in Phuket by the local Chinese with influences from Thai culture.
Several thousand Hindus of Indian origin live in Thailand, mainly in the larger cities. Besides this group of "traditional Hindus", Thailand in its earliest days was under the rule of the Khmer Empire, which had strong Hindu roots, and the influence among Thais remains even today. The popular Ramakien epic is based on the Hindu Ramayana. The former capital of Ayutthaya was named for Ayodhya, the Indian birthplace of the Hindu god Rama.
There is a class of Thai brahmins who perform rituals for Hindu gods. Brahmin rituals are still common, including the use of holy strings for blessing and pouring of lustral water from conch shells. Hindu deities are worshipped by many Thais despite their official Buddhism, and statues and shrines of Brahma, Ganesh, Indra, and Shiva and other Hindu gods are a common sight (for example the Erawan Shrine area). Another relic of Hinduism is Garuda, now a symbol of the monarchy.
According to the 2015 census, Thailand has 2,892,311 Muslims, or 4.29% of the total population. 2,227,613 of these Muslims are concentrated in the southern region of the country, where they represent up to 24.33% of the population.
Christianity was introduced by European missionaries as early as the 1550s, when Portuguese mercenaries and their chaplain arrived in Ayutthaya. Historically, it has played a significant role in the modernisation of Thailand, notably in social and educational institutions. As of 2015 it is the religion of just over 1% of the population of Thailand.
Thailand's Department of Religion, currently under the Ministry of Culture, has formally recognised five major Christian churches/denominations: the Roman Catholic Church, the Southern Baptists, the Seventh-day Adventists, the Church of Christ in Thailand, and the Evangelical Fellowship of Thailand. Although not officially recognised, missionaries of The Church of Jesus Christ of Latter-day Saints (Mormons) have been active in Thailand for decades, though their converts are comparatively few.
Judaism in Thailand dates back to the 17th century, with the arrival of a few Baghdadi Jewish families. The present community consists of both Ashkenazi (for instance the expatriate community plus some descendants of refugees from imperial Russia and later the Soviet Union), and Sephardi Jews, who were born in such places as Afghanistan, Iran and Syria, and wealthy gem traders. Most of the Jewish community in Thailand, consisting of an estimated 2,000 residents, reside in Bangkok, although there are at any given time thousands of tourists (some long-term) coming primarily from Israel. There are Jewish synagogues in Phuket, Chiang Mai, and Ko Samui, but no community there.
The first Sikh known to have come to Thailand was Ladha Singh, who arrived in 1890. Other Sikhs joined him in the early 1900s, and by 1911 more than a hundred Sikh families had settled in Thailand, mainly in Thonburi Region. There were at that time no gurdwaras (Sikh temples), and religious prayers were held in private homes every Sunday and on gurpurab days. The Sikh community continued to grow, and in 1912 it was decided to build a gurdwara. It stands today in Bangkok's Pahurat area and imitates the Golden Temple in Amritsar Punjab, India. A tiny but influential community of Sikhs live in the country's cities, most engaged in retail commerce.
Thai law provides for freedom of religion, and the government generally respects this right in practice. It does not, however, register new religious groups that have not been accepted into one of the existing religious governing bodies on doctrinal or other grounds. In practice, unregistered religious organisations operate freely, and the government's practice of not recognising any new religious groups does not restrict the activities of unregistered religious groups.
The government officially limits the number of foreign missionaries that may work in the country, although unregistered missionaries are present in large numbers and are allowed to live and work freely. There have been no widespread reports of societal abuses or discrimination based on religious belief or practice. However, in the far southern border provinces, continued separatist violence has resulted in mistrust in relations between the Buddhist and Muslim communities.