South Korea Religion Percentage 2025. The largest religion followed in south korea has tended to be buddhism, with 20% or 23% in most surveys except in 2015 where a lower 15.5% was recorded. According to the 2016 census conducted by the korea statistical information service, of the 44 percent of the population espousing a religion, 45 percent are protestant, 35 percent buddhist,.

Protestantism is usually 3 to 5. Despite this, it has grown rapidly and is now the religion.