# Religion in South Korea

* Irreligion (50.7%)
* Christianity (31.3%)
* Buddhism (17%)
* Other (1%)
The majority of South Koreans have no religion. Buddhism and Christianity (Protestantism and Catholicism) are the dominant confessions among those who affiliate with a formal religion.
According to a 2024 Korea Research's regular survey 'Public Opinion in Public Opinion', 51% identify with no religion, 31% with Christianity (Protestantism with 20% and Catholicism with 11%) and 17% with Buddhism and other religions 2%.
Buddhism was influential in ancient times while Christianity had influenced large segments of the population in the 18th and 19th century. However, they grew rapidly in membership only by the mid-20th century, as part of the profound transformations that South Korean society went through in the past century. Since 2000, both Buddhism and Christianity have been declining. Native shamanic religions (i.e. Korean shamanism) remain popular and could represent a large part of the unaffiliated. Indeed, according to a 2012 survey, only 15% of the population declared themselves to be not religious in the sense of "atheism". According to the 2015 census, the proportion of the unaffiliated is higher among the youth, about 64.9% among the 20-years old.
Korea entered the 20th century with an already established Christian presence and a vast majority of the population practicing native religion, Korean shamanism. The latter never gained the high status of a national religious culture comparable to Chinese folk religion, Vietnamese folk religion and Japan's Shinto; this weakness of Korean shamanism was among the reasons that left a free hand to an early and thorough rooting of Christianity. The population also took part in Confucian rites and held private ancestor worship. Organised religions and philosophies belonged to the ruling elites, this coupled with the extensive patronage exerted by the Chinese empire allowed these elites to embrace a particularly strict interpretation of Confucianism (i.e. Korean Confucianism). Korean Buddhism, despite an erstwhile rich tradition, at the dawn of the 20th century was virtually extinct as a religious institution, after 500 years of suppression under the Joseon kingdom. Christianity had antecedents in the Korean peninsula as early as the 18th century, when the philosophical school of Seohak supported the religion. With the fall of the Joseon in the last decades of the 19th century, Koreans largely embraced Christianity, since the monarchy itself and the intellectuals looked to Western models to modernise the country and endorsed the work of Catholic and Protestant missionaries. During Japanese colonisation in the first half of the 20th century, the identification of Christianity with Korean nationalism was further strengthened, as the Japanese tried to combine native Korean shamanism with their State Shinto.
With the division of Korea into two states after 1945, the communist north and the capitalist south, the majority of the Korean Christian population that had been until then in the northern half of the peninsula, fled to South Korea. It has been estimated that Christians who migrated to the south were more than one million. Throughout the second half of the 20th century, the South Korean state enacted measures to further marginalise indigenous Korean shamanism, at the same time strengthening Christianity and a revival of Buddhism. According to scholars, South Korean censuses do not count believers in indigenous Korean shamanism and underestimate the number of adherents of Korean shamanism sects. Otherwise, statistics compiled by the ARDA estimate that as of 2010, 14.7% of South Koreans practice ethnic religion, 14.2% adhere to new movements, and 10.9% practice Confucianism.
According to some observers, the sharp decline of some religions (Catholicism and Buddhism) recorded between the censuses of 2005 and 2015 is due to the change in survey methodology between the two censuses. While the 2005 census was an analysis of the entire population ("whole survey") through traditional data sheets compiled by every family, the 2015 census was largely conducted through the internet and was limited to a sample of about 20% of the South Korean population. It has been argued that the 2015 census penalised the rural population, which is more Buddhist and Catholic and less familiar with the internet, while advantaging the Protestant population, which is more urban and has easier access to the internet. Both the Buddhist and the Catholic communities criticised the 2015 census' results.

## Demographics

| religion | 1950–1962 | 1950–1962 | 1985 | 1985 | 1995 | 1995 | 2005 | 2005 | 2015 | 2015 | 2024 | 2024 |
| religion | num. | % | num. | % | num. | % | num. | % | num. | % | num. | % |
| Christianity (overall) | — | 5−8% | — | 20.7% | 11,390,000 | 26.0% | 13,461,000 | 29.2% | 13,566,000 | 27.6% | 16,030,100 | 31% |
| (Protestantism) | — | 2.8% | — | 16.1% | 8,505,000 | 19.4% | 8,446,000 | 18.3% | 9,676,000 | 19.7% | 10,342,000 | 20% |
| (Catholicism) | — | 2.2% | — | 4.6% | 2,885,000 | 6.6% | 5,015,000 | 10.9% | 3,890,000 | 7.9% | 5,688,100 | 11% |
| Buddhism | — | 2.6% | — | 19.9% | 10,154,000 | 23.2% | 10,588,000 | 22.8% | 7,619,000 | 15.5% | 8,790,700 | 17% |
| other | — | 92.4% | — | 2.1% | — | 1.2% | — | 1% | — | — | 1,034,200 | 2% |
| non-religious | — | — | — | 57.3% | — | 49.6% | — | 47.2% | — | 56.9% | 26,372,100 | 51% |
The percentage of religious beliefs by region in Korea (2024) :
| Administrative area | Protestantism | Catholicism | Buddhism | Other | No Religion |
| Seoul | 22% | 13% | 13% | 1% | 51% |
| Incheon/Gyeonggi | 22% | 12% | 12% | 2% | 52% |
| Daejeon/Sejong/South Chungcheong Province | 21% | 10% | 17% | 2% | 51% |
| Gwangju/Jeolla | 25% | 10% | 11% | 3% | 50% |
| Daegu/North Gyeongsang | 15% | 10% | 24% | 2% | 49% |
| Busan/Ulsan/South Gyeongsang | 14% | 7% | 29% | 2% | 48% |
| Gangwon/Jeju | 17% | 11% | 19% | 2% | 52% |
| Korea National | 20% | 11% | 17% | 2% | 51% |

### Religious affiliation by age (2024)

| Age | Protestantism | Catholicism | Buddhism | Other religions | No affiliation |
| 18–29 | 13% | 7% | 8% | 2% | 69% |
| 30–39 | 16% | 9% | 11% | 2% | 63% |
| 40–49 | 20% | 9% | 14% | 2% | 56% |
| 50–59 | 20% | 9% | 20% | 2% | 49% |
| 60–69 | 23% | 14% | 23% | 1% | 38% |
| Above 70 | 29% | 18% | 22% | 2% | 30% |
| Other religions include Won Buddhism, Confucianism, Cheondoism, Daesun Jinrihoe, Daejongism, and Jeungsanism. ||||||

### Religious affiliation by gender (2024)

| | Protestantism | Catholicism | Buddhism | Other religions | No affiliation |
| Male | 18% | 10% | 16% | 2% | 55% |
| Female | 22% | 12% | 17% | 2% | 47% |
| Other religions include Won Buddhism, Confucianism, Cheondoism, Daesun Jinrihoe, Daejongism, and Jeungsanism. ||||||

## History
### Before 1945

Before the introduction of Buddhism, all Koreans believed in their indigenous religion socially guided by mu (shamans). Buddhism was introduced from the Chinese Former Qin state in 372 to the northern Korean state of Goguryeo and developed into distinctive Korean forms. At that time, the peninsula was divided into three kingdoms: the aforementioned Goguryeo in the north, Baekje in the southwest, and Silla in the southeast. Buddhism reached Silla only in the 5th century, but it was made the state religion only in that kingdom in the year 552. Buddhism became much more popular in Silla and even in Baekje (both areas now part of modern South Korea), while in Goguryeo the Korean indigenous religion remained dominant. In the following unified state of Goryeo (918–1392) Buddhism flourished, and even became a political force.
The Joseon kingdom (1392–1910), adopted an especially strict version of Neo-Confucianism (i.e. Korean Confucianism) and suppressed and marginalised Korean Buddhism and Korean shamanism. Buddhist monasteries were destroyed, and their number dropped from several hundreds to a mere thirty-six; Buddhism was eradicated from the life of towns as monks and nuns were prohibited from entering them and were marginalised to the mountains. These restrictions lasted until the 19th century.
In the late 19th century, the Joseon state was politically and culturally collapsing. The intelligentsia was looking for solutions to invigorate and transform the nation. It was in this critical period that they came into contact with Western Christian missionaries who offered a solution to the plight of Koreans. Christian communities had already existed in Joseon since the 17th century; however, it was only by the 1880s that the government allowed a large number of Western missionaries to enter the country. Christian missionaries set up schools, hospitals and publishing agencies. The royal family supported Christianity.
As the Japanese tried to impose State Shinto during the absorption of Korea into the Japanese Empire (1910–1945), the already formed link of Christianity with Korean nationalism was strengthened, co-opting within it native Korean shamanism, and Christians refused to take part in Shinto rituals. At the same time, numerous religious movements that since the 19th century had been trying to reform the Korean indigenous religion, notably Cheondoism, flourished.

### 1945–2015

With the division of Korea into two states in 1945, the communist north and the anti-communist south, the majority of the Korean Christian population that had been until then in the northern half of the peninsula, fled to South Korea. Christians who resettled in the south were more than one million. Cheondoists, who were concentrated in the north like Christians, remained there after the partition, and South Korea now has no more than few thousands Cheondoists.
The so-called "movement to defeat the worship of gods" promoted by governments of South Korea in the 1970s and 1980s prohibited indigenous cults and wiped out nearly all traditional shrines (sadang 사당) of the Confucian kinship religion. This was particularly tough under the rule of Park Chung Hee, who was a Buddhist. This measure, combined with the rapid social changes of the same period, favoured a rapid revival of Buddhism, as it traditionally intermingled with folk religion and allowed a way for these traditional believers to express their folk beliefs in the context of an officially accepted religion. This period also saw the growth of Christian churches in a trend to register as members of organised religions.
The number of Buddhist temples rose from 2,306 in 1962 to 11,561 in 1997, Protestant churches rose from 6,785 in 1962 to 58,046 in 1997, the Catholic Church had 313 churches in 1965 and 1,366 in 2005, Won Buddhism had 131 temples in 1969 and 418 in 1997. Similarly, Daesun Jinrihoe's temples have grown from 700 in 1983 to 1,600 in 1994. Statistics from censuses show that the proportion of the South Korean population self-identifying as Buddhist has grown from 2.6% in 1962 to 22.8% in 2005, while the proportion of Christians has grown from 5% in 1962 to 29.2% in 2005. However, both religions have shown a decline between the years 2005 and 2015, with Buddhism sharply declining in influence to 15.5% of the population, and a less significant decline of Christianity to 27.6%.
According to Pew Research Center (2010), about 46% of the population had no religious affiliation, 23% are Buddhist and 29% are Christians. According to 2015 national census, 56.1% are irreligious, Protestantism represents (19.7%) of the total population, Korean Buddhism (15.5%), and Catholicism (7.9%). A small percentage of South Koreans (0.8% in total) are members of other religions, including Won Buddhism, Confucianism, Cheondoism, Daesun Jinrihoe, Islam, Daejongism, Jeungsanism and Eastern Orthodox Christianity.

### 2015–present

In response to the rapidly changing demographics of religion in South Korea, 여론 속의 여론 (Yeolon Sog-ui Yeolon) a Korean research journal, performed a survey on the present religious demographic in South Korea. According to the survey, new results deviate from the traditional sentiments of South Korean culture. While much of the population is irreligious, Protestants make up the largest religious group. The latter half of the population that are religious, are split in the following way: 20% believe in Protestantism, 16% believe in Buddhism, 13% believe in Catholicism, and 1% believe in other religions or cults. Essentially, the studies findings show that 50% of South Koreans are now non-religious, 32% follow some section of Christianity, 16% are Buddhist, and 2% believe in some other form of religion. The deviation from the traditionally religious South Korean culture and demographics is the rise of atheism.
Previous to this sudden change, A Cohort Analysis of Religious Population Change in Korea launched by the Korean Citation Index analyzed South Korean religious demographics from 1999 to 2015. The data from the study focused on understanding religious conversion, switching, or abandonment within the demographic. Today, the study has given insight on the potential effects of the deviation in South Korea's religious demographic.
The study performed by the research journal, 여론 속의 여론 (Yeolon Sog-ui Yeolon), discovered that the change in the South Korean religious demographics stemmed from the youth. The younger demographic of South Korea tend to have a higher percentage of atheists, while the older demographics have remained relatively religious. The study states that 33% of South Koreans who are around the age of 20 believe in religion, while above 61% of those aged 60 or older continue to believe in religion. The study also reveals that the demographic of believers and non believers are also affected by many more variables. For example, the specific religion and the age at which the religion was introduced to the individual can have effects on the probability of an individual to stay religious throughout their lives. Overall, there seems to be a large deviation between those who were introduced to religion before elementary and those who were introduced after their 50s. Of 101 individuals interviewed, 29 were introduced to religion before elementary school, 18 during elementary, 9 in their 40s, and 7 in their 50s. While Catholicism and Protestantism maintained a similar standard deviation, believers of Buddhism seemed to start during and near their 30s. With the younger generation of South Korea remaining increasingly non-religious and South Korea traditionally being a religious nation, the developments of South Korea's religious demographics will have many implications on the nation's culture, politics, and way of life.

### Protestant attacks on traditional religions

Since the 1980s and the 1990s, there have been acts of hostility committed by Protestants against Buddhists and followers of traditional religions in South Korea. This include the arson of temples, the beheading of statues of Buddha and bodhisattvas, and red Christian crosses painted on either statues or other Buddhist and other religions' properties. Some of these acts have even been promoted by churches' pastors.

## Dominant religions
### Buddhism
#### Arrival and spread since 4th century

Buddhism (불교/佛敎 Bulgyo) entered Korea from China during the period of the three kingdoms (372, or the 4th century). Buddhism was the dominant religious and cultural influence in the North–South States Period (698–926) and subsequent Goryeo (918–1392) states. Confucianism was also brought to Korea from China in early centuries, and was formulated as Korean Confucianism in Goryeo. However, it was only in the subsequent Joseon kingdom (1392–1910) that Korean Confucianism was established as the state ideology and religion, and Korean Buddhism underwent 500 years of suppression. Buddhism in the contemporary state of South Korea is stronger in the east of the country, namely the Yeongnam and Gangwon regions, as well as in Jeju.

#### Denominations
##### Korean Zen or Seon Buddhism

There are a number of different schools in Korean Buddhism (대한불교/大韓佛敎 Daehanbulgyo), including the Seon (Korean Zen). Seon is represented by Jogye Order and Taego Order. The overwhelming majority of Buddhist temples in contemporary South Korea belong to the dominant Jogye Order, traditionally related to the Seon school. The order's headquarters are at Jogyesa in central Seoul, and it operates most of the country's old and famous temples, such as Bulguksa and Beomeosa. Jogye requires their monastics to be celibate. Taego lineage is a form of Seon (Zen) and it differs from Seon by allowing priests to marry.

##### Jingak and Cheontae Buddhism

Jingak Order, is a modern esoteric form of Vajrayana Buddhism, which also permits its priests to marry. Cheontae is a modern revival of the Tiantai lineage in Korea, focusing on the Lotus Sutra. Cheontae orders requires their monastics to be celibate.

##### Won Buddhism

Won Buddhism (원불교/圓佛敎 Wonbulgyo) is a modern reformed Buddhism that seeks to make enlightenment possible for everyone and applicable to regular life. The scriptures and practices are simplified so that anyone, regardless of their wealth, occupation, or other external living conditions, can understand them.

#### Growth: Number of temples by denomination

907 major Korean Buddhist temples by school (2005) :
| School | Temples |
| Jogye Order (조계종/曹溪宗) | 735 (81%) |
| Cheontae Order (천태종/天台宗) | 144 (16%) |
| Taego Order (태고종/太古宗) | 102 (11%) |
| Beobhwa Order (법화종/法華宗) | 22 (2%) |
| Seonhag-won (선학원/禪學院) | 16 (2%) |
| Wonhyo Order (원효종/元曉宗) | 5 (1%) |
| Other | 27 (3%) |

#### Buddhism's syncretic influence on Korea culture

According to a 2005 government survey, a quarter of South Koreans are practicing Buddhist. However, the actual number of Buddhists in South Korea is ambiguous as there is no exact or exclusive criterion by which Buddhists can be identified, unlike the Christian population. With Buddhism's incorporation into traditional Korean culture, it is now considered a philosophy and cultural background rather than a formal religion. As a result, many people outside of the practicing population are deeply influenced by these traditions. Thus, when counting secular believers or those influenced by the faith while not following other religions, the number of Buddhists in South Korea is considered to be much larger. Similarly, in officially atheist North Korea, while Buddhists officially account for 4.5% of the population, a much larger number (over 70%) of the population are influenced by Buddhist philosophies and customs.

### Christianity
#### Arrival in late 18th century

Foreign Catholic missionaries did not arrive in Korea until 1794, a decade after the return of Yi Sung-hun, a diplomat who was the first baptised Korean in Beijing. He established a grass roots lay Catholic movement in Korea. However, the writings of the Jesuit missionary Matteo Ricci, who was resident at the imperial court in Beijing, had been already brought to Korea from China in the 17th century. Scholars of the Silhak ("Practical Learning") were attracted to Catholic doctrines, and this was a key factor for the spread of the Catholic faith in the 1790s.

#### Denominations

Christianity (그리스도교/----敎 Geurisdogyo or 기독교/基督敎 Gidoggyo, both meaning religion of Christ) in South Korea is dominated by four denominations: Catholic (천주교/天主敎 pronounced Cheonjugyo), Protestant Presbyterianism (장로교 pronounced Jangnogyo), Methodism (감리교 pronounced Gamnigyo) and Baptists (침례교 pronounced Chimnyegyo). The Yoido Full Gospel Church is the largest Pentecostal church in the country. Some non-denominational churches also exist. According to 2015 census, Protestants and Catholics numbered 9.6 million and 3.8 million respective. There are also small Eastern Orthodox communities.

##### Protestantism

Protestant missionaries entered Korea during the 1880s and, along with Catholic priests, converted a remarkable number of Koreans, this time with the support of the royal government which winked at Westernising forces in a period of deep internal crisis (due to the waning of centuries-long patronage from a then-weakened China). The lack of a national religious system compared to those of China and that of Japan (Korean Korean shamanism never developed to a high status of institutional and civic religion) gave a free hand to Christian churches. Methodist and Presbyterian missionaries were especially successful. They established schools, universities, hospitals, and orphanages and played a significant role in the modernisation of the country.
Anglican Church of Korea also is one of Protestant denominations. Unlike other protestant denominations in Korea, it is influenced by Commonwealth realms such as Church of England, Scottish Episcopal Church, Anglican Church of Canada, Anglican Church of Australia, Anglican Church in Aotearoa, New Zealand and Polynesia rather than North American missionaries. They concentrate on harmonisation of Traditional Korean Architecture and European Architecture such as Ganghwa Anglican Cathedral and usually invest on School and supporting minorities such as labourers and LGBT in Korea.

##### Catholicism

The penetration of Western ideas and Christianity in Korea became known as Seohak ("Western Scholar"). A study of 1801 found that more than half of the families that had converted to Catholicism were linked to the Seohak school. Largely because converts refused to perform Confucian ancestral rituals, the Joseon government prohibited Christian proselytising. Some Catholics were executed during the early 19th century, but the restrictive law was not strictly enforced. A large number of Christians lived in the northern part of the peninsula (it was part of the so-called "Manchurian revival") where Confucian influence was not as strong as in the south. Before 1948 Pyongyang was an important Christian centre: one-sixth of its population of about 300,000 people were converts. Following the establishment of the communist regime in the north, an estimated more than one million Korean Christians resettled to South Korea to escape persecution by North Korea's anti-Christian policies. Catholicism in Korea grew significantly during the 1970s to 1980s.

##### Orthodoxy

Orthodox Christian missionaries entered Korea from Russia in 1900. In 1903, the first Eastern Orthodox church in Korea was established. However, the Russo-Japanese War in 1904 and the Russian Revolution in 1917 interrupted the activities of the mission. After the North's army abducted Korea's only Orthodox priest at the time, Fr. Alexi Kim, at the start of the Korean War in 1950, and after the St. Nicholas Church building was destroyed by the 1951 bombing of Seoul, the small flock of Orthodox faithful was at risk of annihilation. In 1955, the Orthodox faithful of Korea wrote a letter to the Holy Synod of the Ecumenical Patriarchate asking to come under the Ecumenical Patriarchate's spiritual care and jurisdiction. Their request was granted, and the development and growth of the Church in Korea began to accelerate. Today, the roughly 5,000 Orthodox faithful of Korea remain under the Ecumenical Patriarchate of Constantinople, whose Holy Synod elevated the flourishing Church in Korea in 2004 to the status of a "Metropolis." The non-Chalcedonian Coptic Church of Alexandria was first established in Seoul in 2013 for Egyptian Copts and Ethiopians residing in South Korea.

##### Others

The Church of Jesus Christ of Latter-day Saints in South Korea was established following the baptism of Kim Ho Jik in 1951, which had 81,628 members in 2012 with one temple in Seoul, four Mormon missions (Seoul, Daejeon, Busan, and Seoul South), 128 congregations, and twenty-four family history centres.
There are an estimated 2 million South Koreans who attend fringe churches not recognized by the Christian Council of Korea, the Communion of Churches in Korea and the Council of Denomination Heads for Korean Church Unity.
Sun Myung Moon's Unification Church (통일교 Tongilgyo) is a new religious movement founded in South Korea in 1954 by Sun Myung Moon, which has financed many organizations and businesses in news media, education, politics and social activism. In 2003, Korean Unification Church members started a political party named "The Party for God, Peace, Unification, and Home".
World Mission Society Church of God, Victory Altar, Shincheonji Church, Christian Gospel Mission (also known as JMS or Providence), Grace Road Church and Evangelical Baptist Church of Korea are other Korean new religious movements that originated within Christianity. Other fringe Christian churches include the Manmin Central Church.

#### Causes of growth of Christianity

Factors contributing to the growth of Catholicism and Protestantism included the decayed state of Korean Buddhism, the support of the intellectual elite, and the encouragement of self-support and self-government among members of the Korean church, and finally the identification of Christianity with Korean nationalism. Christianity grew significantly in the 1970s and 1980s. In the 1990s and 2000s it continued to grow, but at a slower rate. Christianity is especially dominant in the west of the country including Seoul, Incheon, and the regions of Gyeonggi and Honam.

#### Opposition to syncretic traditions

Fundamentalist Christians continue to oppose the syncretic aspects of the culture including Confucian traditions and ancestral rites practiced even by secular people and followers of other faiths. Consequently, many Korean Christians, especially Protestants, have abandoned these native Korean traditions. Protestants in Korea have a history of attacking Buddhism and other traditional religions of Korea with arson and vandalism of temple and statues, some of these hostile acts have been promoted by the church.
After the ban on traditional civil rites was lifted by Pope Pius XII in 1939, many Korean Catholics openly observe jesa (ancestral rites); the Korean tradition is very different from the institutional religious ancestral worship that is found in China and Japan and can be easily integrated as ancillary to Catholicism. Protestants, by contrast, have completely abandoned the practice.

## Indigenous religions
### Korean shamanism

Korean shamanism, also known as "Muism" (Korean: 무교; Hanja: 巫敎; RR: Mugyo), and "Musok" (무속; 巫俗) is the native religion of the Koreans. Although used synonymously, the two terms are not identical: Jung Young Lee describes Muism as a form of Korean shamanism - the shamanic tradition within the religion. Particularly akin to Japan's Shinto, contrariwise to it and to China's religious systems, Korean shamanism never developed into a national religious culture.
In contemporary Korean language the shaman-priest or mu (Hanja: 巫) is known as a mudang (Korean: 무당; Hanja: 巫堂) if female or baksu if male, although other names and locutions are used. Korean mu "shaman" is synonymous with Chinese wu, which denotes priests both male and female. The role of the mudang is to act as intermediary between the spirits or gods and the human plane, through gut (rituals), seeking to resolve problems in the patterns of development of human life.
Central is interaction with Haneullim or Hwanin, meaning "source of all being", and of all gods of nature, the utmost god or the supreme mind. The mu are mythically described as descendants of the "Heavenly King", son of the "Holy Mother [of the Heavenly King]", with investiture often passed down through female princely lineage. However, other myths link the heritage of the traditional faith to Dangun, male son of the Heavenly King and initiator of the Korean nation.
Besides Japanese Shinto, Korean religion has also similarities with Chinese Wuism, and is akin to the Siberian, Mongolian, and Manchurian religious traditions. Some studies trace the Korean ancestral god Dangun to the Ural-Altaic Tengri "Heaven", the shaman and the prince. In the dialects of some provinces of Korea the shaman is called dangul dangul-ari. The mudang is similar to the Japanese miko and the Ryukyuan yuta. Muism has exerted an influence on some Korean new religions, such as Cheondoism and Jeungsanism. According to various sociological studies, Korea's type of Christianity owes much of its success to native shamanism, which provided a congenial mindset and models for the religion to take root.
In the 1890s, the last decades of the Joseon kingdom, Protestant missionaries gained significant influence, and led a demonisation of native religion through the press, and even carried out campaigns of physical suppression of local cults. The Protestant discourse would have had an influence on all further attempts to uproot native religion. The "movement to destroy Korean shamanism" carried out in South Korea in the 1970s and 1980s, destroyed much of the physical heritage of Korean religion (temples and shrines), especially during the regime of President Park Chung Hee. There has been of a revival of shamanism in South Korea in most recent times.

### Cheondoism

Cheondoism (천도교 Cheondogyo) is a fundamentally Confucian religious tradition derived from indigenous Sinism. It is the religious dimension of the Donghak ("Eastern Learning") movement that was founded by Choe Je-u (1824–1864), a member of an impoverished yangban (aristocratic) family, in 1860 as a counter-force to the rise of "foreign religions", which in his view included Buddhism and Christianity (part of Seohak, the wave of Western influence that penetrated Korean life at the end of the 19th century). Choe Je-u founded Cheondoism after having been allegedly healed from illness by an experience of Sangje or Haneullim, the god of the universal Heaven in traditional shamanism.
The Donghak movement became so influential among common people that in 1864 the Joseon government sentenced Choe Je-u to death. The movement grew and in 1894 the members gave rise to the Donghak Peasant Revolution against the royal government. With the division of Korea in 1945, most of the Cheondoist community remained in the north, where the majority of them dwelled. Only few thousands of them remain in South Korea today.
The social and historical significance of the Donghak movement and Cheondoism has been largely ignored in South Korea, contrarywise to North Korea where Cheondoism is viewed positively as a folk (minjung) movement.

### Other sects

Apart from Cheondoism, other sects based on indigenous religion were founded between the end of the 19th century and the early decades of the 20th century. They include Daejongism (대종교 Daejonggyo), which has as its central creed the worship of Dangun, legendary founder of Gojoseon, thought of as the first proto-Korean kingdom; and a splinter sect of Cheondoism: Suwunism.
Jeungsanism (증산교 Jeungsangyo) defines a family of religions founded in the early 20th century that emphasise magical practices and millenarian teachings of Kang Jeungsan (Gang Il-Sun). There are more than a hundred "Jeungsan religions," including the now defunct Bocheonism: the largest in Korea is currently Daesun Jinrihoe (대순진리회), an offshoot of the still existing Taegeukdo (태극도), while Jeungsando (증산도) is the most active overseas.
There are also a number of small religious sects, which have sprung up around Gyeryongsan ("Rooster-Dragon Mountain", always one of Korea's most-sacred areas) in South Chungcheong Province, the supposed future site of the founding of a new dynasty originally prophesied in the 18th century (or before). Japanese Tenriism (천리교 Cheonligyo) also claims to have thousands of South Korean members.
According to Andrew Eungi Kim, there was a rise of new religious movements in the late 1900s which account for about 10 percent of all churches in South Korea. According to Kim, this is the outcome of foreign invasions, as well as conflicting views regarding social and political issues. Many of the new religious movements are syncretic in character.

## Other religions
### Bahá'í Faith

Baháʼí Faith was first introduced to Korea by an American woman named Agnes Alexander.

### Confucianism

Only few contemporary South Koreans identify as adherents of Confucianism (유교 Yugyo). Korean intellectuals historically developed a distinct Korean Confucianism. However, with the end of the Joseon state and the wane of Chinese influence in the 19th and 20th century, Confucianism was abandoned. The influence of Confucian ethical thought remains strong in other religious practices, and in Korean culture in general. Confucian rituals are still practised at various times of the year. The most prominent of these are the annual rites held at the Shrine of Confucius in Seoul. Other rites, for instance those in honour of clan founders, are held at shrines found throughout the country.

### Hinduism

Hinduism (힌두교 Hindugyo) is practiced among South Korea's small Indian, Nepali and Balinese migrant community. However, Hindu traditions such as yoga and Vedanta have attracted interest among younger South Koreans. Hindu temples in the Korea include the Sri Radha Shyamasundar Mandir in central Seoul, Sri Lakshmi Narayanan Temple in metropolitan Seoul, Himalayan Meditation and Yoga Sadhana Mandir in Seocho in Seoul, and Sri Sri Radha Krishna temple in Uijeongbu 20 km away on outskirt of Seoul.

### Islam

There are around a hundred thousand foreign workers from Muslim countries, particularly Uzbeks, Indonesians, Malaysians, Bruneians, Pakistanis, Kazakhs and Bangladeshis.

### Shinto

During Japan's colonisation of Korea (1910–1945), given the suggested common origins of the two peoples, Koreans were considered to be outright part of the Japanese population, to be wholly assimilated. The Japanese studied and coopted native Korean shamanism by overlapping it with their State Shinto (similar measures of assimilation were applied to Buddhism), which hinged upon the worship of Japanese high gods and the emperor's godhead. Hundreds of Japanese Shinto shrines were built throughout the peninsula. This policy led to massive conversion of Koreans to Christian churches, which were already well ingrained in the country, representing a concern for the Japanese program, and supported Koreans' independence. After the Allied forces defeated Japan in 1945, Korea was liberated from Japanese rule. As soon as the Shinto priests withdrew to Japan, all Shinto shrines in Korea were either destroyed or converted into another use.
There is a tiny presence of Sect Shinto groups, Zenrinkyo and Daehan Cheolligyo, in South Korea today.

### Sikhism

Sikhs have been in South Korea for 50 years. The first South Korean gurdwara was established in 2001. There are about 550 Sikhs in South Korea, now recently the Sikhs in South were allowed to acquire South Korean citizenship.