Religion
Freedom of religion is guaranteed by what?
South Korea
As of 2005, just under half of the South Korean population expressed no religious preference. Of the rest, most are Buddhist or Christian. According to the 2007 census, 29.2% of the population at that time was Christian (18.3% identified themselves as Protestants, 10.9% as Roman Catholics), and 22.8% were Buddhist. Other religions include Islam and various new religious movements such as Jeungsanism, Cheondoism and Wonbuddhism. The earliest religion practiced was Korean shamanism. Today, freedom of religion is guaranteed by the constitution, and there is no state religion. Christianity is South Korea's largest religion, accounting for more than half of all South Korean religious adherents. There are approximately 13.7 million Christians in South Korea today, about 63% of Christians belong to Protestant churches, while about 37% belong to the Roman Catholic Church. The number of Protestant Christians have slowly decreased since 1990s, while the number of Roman Catholics has rapidly increased since 1980s. Presbyterian denominations are the biggest Christian denominations in South Korea. About 9 million people belongs to the 100 different Presbyterian churches, among the biggest denominations are the Presbyterian Church in Korea (HapDong), Presbyterian Church in Korea (TongHap), the Presbyterian Church in Korea (Koshin). For more information see Presbyterianism in South Korea. South Korea is also the second-largest missionary-sending nation, after the United States. Buddhism was introduced to Korea in the year 372. According to the national census as of 2005, South Korea has over Buddhists. Today, about 90% of Korean Buddhists belong to Jogye Order. Most of the National Treasures of South Korea are Buddhist artifacts. Buddhism became the state religion in some of Korean kingdoms since the Three Kingdoms Period, when Goguryeo adopted it as the state religion in 372, followed by Baekche (528). Buddhism had been the state religion of Unified Korea from North South States Period (not to be confused with the modern division of Korea) to Goryeo before suppression under the Joseon Dynasty in favor of Neo-Confucianism. Fewer than 30,000 South Koreans are thought to be Muslims, but the country has some 100,000 resident foreign workers from Muslim countries, Bangladesh and Pakistan. Korean shamanism, today known as Muism (religion of the mu ) or Sinism (religion of the gods) encompasses a variety of indigenous religious beliefs and practices of the Korean people and the Korean sphere. In contemporary South Korea, the most used term is "Muism" and a shaman is known as a "mudang" (, ) or Tangol (당골). Since the early 2000s, this religion has regained popularity among Koreans.