The majority of Thai people follow Theravada Buddhism. Even though the King and members of the Royal Family are Buddhists and Buddhism has had an influence on the beliefs of Thai people since ancient times, the 2007 Constitution of the Kingdom of Thailand does not say that Buddhism is the religion of the State. It says merely that Buddhism is the religion that most Thai people have respected for a very long time.
Thailand offers freedom of religion as long as the exercise of religious freedom “is not harmful to the security of the State.” The law officially recognizes five religious groups: Buddhists, Muslims, Brahmin-Hindus, Sikhs, and Christians. All recognized religions receive religious subsidies and tax benefits.
In Thailand, the people can be grouped by the religions they respect, as follows: 93.5% respect Buddhism, 5.4% respect Islam, 1.1% respect Christianity, and 0.1% are people who respect other religions or are people without religion (Source: Data from the 2018 survey on conditions of society and culture, the Office for National Statistics).