Most of fhe People in Korea would go to church on Sundays. Few would go to temples. Some people would visit temple or church just because they are beautiful, not necessarily because they believe that religion. In Korea, children can choose different religion from their parents. Some of my collegues use to say "My parents are Buddhist but I am Christian".
While in Bhutan, if a person is born in a Buddhist family, you become Buddhist. It is safe to say that in the case of Bhutan, you are born with a religion. It is rare to see children and parents believing different religion. Bhutan's population consist of around 30% Nepali ethnic who believe in Hinduism. Most of them believe practice both hinduism and buddhism. Despite the differences, Bhutanese citizens doesn't show hostility towards any religion.
In Korea, temples are decorated with paper lanterns occasionally. Many Koreans visit the temple to pray and some to enjoy the night scenary of the beautiful lanterns. In Seoul, we can also see many foreigners visiting temples with cameras.