<P> Religion in South Korea (2015) (Note: Percentages are rounded .) </P> <P> Religion in South Korea is characterised by the fact that a majority of South Koreans (56.1% as of the 2015 national census) have no formal affiliation with a religion . Among those who are members of a religious organisation, there is a dominance of Protestantism (19.7%), Buddhism (15.5%), and Catholicism (7.9%), percentages of the total population . A small percentage of South Koreans (0.8% in total) are members of other religions, including Won Buddhism, Confucianism, Cheondoism, Daesun Jinrihoe, Daejongism, and Jeungsanism . </P> <P> Buddhism was influential in ancient times and Christianity persuaded large segments of the population already in the 18th and 19th century, yet 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, and then have shown some decline from the 2000s onwards . Native shamanic religions (i.e. Sindo) remain popular and could represent a large part of the unaffiliated . Indeed, according to a 2012 survey, only 15% of the population declared 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 65% among the 20 - years old . </P>

What is the most practiced religion in south korea