Religion in South Korea: Major Faiths, Demographics & History

The largest religion in South Korea is Christianity, followed by about 29% of the population (20% Protestant and 9% Catholic), while Buddhism is followed by roughly 16%. Strikingly, the largest single group is the religiously unaffiliated, at about 56% of South Korea's 52 million people. This makes South Korea one of the most religiously diverse and rapidly changing societies in Asia, and the rare Asian nation where Christianity outnumbers Buddhism.

Major Religions and Demographics

South Korea has one of the most dynamic and rapidly shifting religious landscapes in Asia. According to the most recent census data, the breakdown of religious identity looks like this:

A clear majority of South Koreans, around 56%, report having no formal religious affiliation. This does not necessarily mean they are atheists in a strict sense; many still observe traditional customs, consult fortune-tellers, or take part in Confucian ancestral rites. Among those who do identify with a faith, Protestant Christianity leads at roughly 20%, followed by Buddhism at 16% and Catholicism at 9%. A small remainder, about 1%, belong to other religions and new religious movements.

What makes South Korea unusual is that Christianity, when Protestant and Catholic figures are combined, is the dominant organised faith among believers. The country is home to several of the world's largest megachurches, most famously the Yoido Full Gospel Church in Seoul, which claims roughly 480,000 members. Meanwhile Confucianism, although not recorded as a religion in census surveys, remains a deep cultural undercurrent shaping family life, education, and social hierarchy.

A Brief History of Religion in Korea

Korea's oldest spiritual traditions are indigenous shamanism (muism) and, later, Buddhism. Shamanism centres on mudang (shamans) who mediate between humans and spirits, and its rituals predate recorded history. Buddhism arrived from China in the 4th century CE and gradually became the state religion during the Goryeo Dynasty (918-1392), an era that produced magnificent temples, sculpture, and the carving of Buddhist scriptures.

The succeeding Joseon Dynasty (1392-1897) reversed this, adopting Neo-Confucianism as the official state ideology and actively suppressing Buddhism, pushing temples into the mountains where many still stand today. This Confucian foundation explains why values such as filial piety, respect for elders, and the prestige of scholarship remain so powerful in modern Korean life.

Christianity entered later and grew with remarkable speed. Roman Catholic ideas reached Korea through scholars in the late 18th century, initially spread by Koreans themselves rather than foreign clergy. Protestant missionaries, many of them American, arrived in the late 19th century and founded schools and hospitals that gave Christianity a reputation for modernity. The faith expanded dramatically after the Korean War (1950-1953), when it became associated with national reconstruction, American influence, democracy, and opposition to communism. Today South Korea sends more Christian missionaries abroad than any country except the United States. Korea has also generated home-grown new religious movements, including Cheondoism, rooted in the 19th-century Donghak movement, and Unificationism, founded by Sun Myung Moon.

Buddhism and Confucian Heritage

Although Buddhism is now the second-largest organised faith, it retains enormous cultural and artistic importance. Korean Buddhism is dominated by the Jogye Order, a Seon (Zen) tradition, and remains especially visible in rural and mountainous regions. Major Buddhist holidays such as the Buddha's Birthday, marked by colourful lantern festivals, are celebrated nationwide.

Confucianism functions less as a worship-based religion and more as an ethical and social framework. Its influence is felt in the strong emphasis Korean society places on education, the respect shown to age and seniority, and the continued practice of jesa, or ancestral memorial rites. Even non-religious Korean families perform these rites during major holidays, illustrating how Confucian values transcend formal religious belief.

Religious Sites and Landmarks

South Korea's faiths have left a remarkable architectural legacy, several pieces of which are recognised by UNESCO:

• Bulguksa Temple (Gyeongju): A UNESCO World Heritage Site built in the 8th century during the Silla Dynasty, regarded as a masterpiece of Korean Buddhist architecture.
• Seokguram Grotto: Near Bulguksa, this artificial grotto houses a serene stone Buddha widely considered one of the finest works of East Asian Buddhist art.
• Haeinsa Temple: Home to the Tripitaka Koreana, more than 80,000 wooden printing blocks of Buddhist scripture, listed in UNESCO's Memory of the World register.
• Myeongdong Cathedral (Seoul): The seat of Korean Catholicism and a symbolic centre of the pro-democracy movement during the 1980s.
• Yoido Full Gospel Church (Seoul): The largest single Christian congregation in the world, a landmark of modern Korean Protestantism.

Religion in Daily Life

South Korea's religious diversity is visible on almost every city street, where the glowing red neon crosses of Protestant churches sit alongside Buddhist temples and small shamanic shrines. Sunday worship is well attended among Christians, and Bible study groups serve as important social networks. Buddhist temples, meanwhile, offer popular "templestay" programs in which visitors, Korean and foreign alike, experience monastic life, meditation, and vegetarian temple cuisine.

Traditional and modern beliefs blend seamlessly in everyday routines. Many South Koreans, regardless of stated religion, consult fortune-tellers before weddings, business launches, or naming a child. Christmas is a public holiday, an unusual feature for an Asian country and a clear sign of Christianity's cultural reach. At the same time, the great seasonal festivals of Chuseok (the autumn harvest festival) and Seollal (Lunar New Year) revolve around Confucian ancestral rites that nearly all families observe.

Key Facts

• Largest organised religion: Christianity (about 29%, combining Protestants and Catholics)
• Largest single group: The non-religious, at roughly 56% of the population
• Major faiths: Protestantism (20%), Buddhism (16%), Catholicism (9%)
• Population: Approximately 52 million
• Oldest traditions: Indigenous shamanism and Buddhism (introduced in the 4th century CE)
• Cultural backbone: Confucianism, shaping family, education, and social values
• Largest church: Yoido Full Gospel Church in Seoul (~480,000 members)

Frequently Asked Questions

What is the main religion in South Korea?

Christianity is the largest organised religion, followed by about 29% of the population when Protestants (20%) and Catholics (9%) are combined. However, the single largest group overall is the non-religious, who make up around 56% of South Koreans.

Why is Christianity so strong in South Korea compared to other Asian countries?

Christianity grew rapidly after the Korean War, when it became linked with modernization, education, American influence, democracy, and anti-communism. Missionary-founded schools and hospitals gave the faith prestige, and South Korea now sends more missionaries abroad than any country except the United States.

Is Buddhism still important in South Korea?

Yes. Although Buddhism is now the second-largest organised faith at about 16%, it has profound cultural and artistic significance. Many of Korea's most treasured landmarks, including Bulguksa Temple and Haeinsa, are Buddhist, and festivals such as the Buddha's Birthday are celebrated nationwide.

What role does Confucianism play in Korean religion?

Confucianism is not usually counted as a religion in censuses, but it deeply shapes Korean society. Values like respect for elders, devotion to education, and ancestor veneration are widely shared, and Confucian ancestral rites are performed by most families during holidays such as Chuseok and Seollal.