In the 2020s North Korea had collapsed, and after a war, the former nation was annexed back into South Korea, and reunification was achieved.
In the 2030s, Christianity became banned again and harsher laws were put into force to crack down on those who follow it. Buddhism, Taoism, Confucianism, and Korean shamanism, were strongly promoted. Atheists and the Irreligious were also accepted. Cheondoism was forced to remove its Christian influences.
By 2050, all Christian Churches were demolished and replaced with Buddhist, Taoist, and Confucian Temples.