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Modern South Korea is majority Chondoist, mainly because Chondoists led the non-socialist independence movement against Japan (while Buddhism was significantly discredited due to Japanese collaboration) and were later propped up by Americans and the military regime as a religious bulwark against Communism.
The most recent census suggests:
28.1% unaffiliated
43.7% Cheondoist
24.6% Buddhist
2.8% Christian (72% Catholic, 28% Protestant)
0.8% Other
With a POD of 1900, is it remotely plausible to have Christianity (a combination of Protestantism and Confucianism) be the largest religion in South Korea?
Bonus points if it's not Catholicism, followed by more than two-thirds of Korea's Christian community, but Evangelical Protestantism instead.