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Religion in South Korea

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According to the results of the 2025 edition of the Korea Research "Public Opinion in Public Opinion" survey, 51% of South Koreans report having no religion; 31% identify with Christianity (20% with Protestantism and 11% with Catholicism); 16% identify with Buddhism; and 1% identify with other religions.

Buddhism was influential in ancient times, while Christianity influenced large segments of the population in the 18th and 19th centuries. However, the two traditions grew most rapidly in membership in the mid-20th century, as South Korean society underwent profound transformations. Since 2000, both Buddhism and Christianity have been declining in adherents. Native shamanic religions (namely, Korean shamanism) remain popular and may account for a large share of the seemingly irreligious. Indeed, according to a 2012 survey, only 15% of the population identified as nonreligious in an atheistic sense. According to the 2015 census, the prevalence of irreligion among South Koreans is highest among youth—about 64.9% among then-20-year-olds.

Korea entered the 20th century with a well-established Christian presence, but most of the population practiced native Korean shamanism. The latter tradition never attained the status of a national religious culture comparable to Chinese folk religion, Vietnamese folk religion, or Japanese Shinto; the weakness of Korean shamanism was one of the reasons Christianity became deeply rooted early on. A large share of the population also took part in Confucian rites and held private ancestor worship ceremonies. Adherence to organised religions and philosophies was largely limited to the ruling elites, which, when coupled with the extensive patronage exerted by the Chinese empire, allowed elites to embrace a particularly strict interpretation of Confucianism (namely, Korean Confucianism). Korean Buddhism, despite having an erstwhile rich tradition, was virtually extinct as a Korean religious institution at the dawn of the 20th century, after 500 years of suppression by the Joseon kingdom. Christianity had followers 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, the population largely embraced Christianity, as the monarchy and Korean intellectuals looked to the West as a model for modernizing the country and endorsed the work of Catholic and Protestant missionaries. During Japanese colonisation in the first half of the 20th century, the linking of Christianity with Korean nationalism was further reinforced by opposition to the Japanese effort to merge native Korean shamanism with State Shinto.

With the division of Korea into two states after 1945, the North and the capitalist South, the majority of the Korean Christian population, which had been centered in the northern half of the peninsula, fled to the nascent South Korea. It has been estimated that Christians who migrated to the south numbered more than one million. Throughout the second half of the 20th century, the South Korean state enacted measures to further marginalise indigenous Korean shamanism; the measures further strengthened Christianity and fostered 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.

Some observers suggest that the significant drop in the number of adherents of religions such as Catholicism and Buddhism between the 2005 and 2015 censuses is due to changes in survey methods. The 2005 census involved a comprehensive analysis of the entire population, using traditional data sheets completed by each family. In contrast, the 2015 census primarily used the internet and surveyed only about 20% of the South Korean population as a sample. Critics argue that this shift disadvantaged rural populations, who tend to be more Buddhist and Catholic and less internet-versed, while benefiting urban Protestant groups with better internet access. Both Buddhist and Catholic communities have criticized the results of the 2015 census.

Demographics

Religious affiliation by age (2025)

Religious affiliation by gender (2025)

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