Buddhism.
Buddhism
Buddhism and Hinduism.
Buddhism.
Zen Buddhism arrived in Japan because of China and that Bhutan is an entirely Buddhist country.
Bhutan's constitution guarrantees freedom of religion for all citizens, but the state religion is Vajrayna Buddhism. A quater of the population is Hindu as well.
The religion is Buddhism. Specifically Tibetan Buddhism. less than 10% are Hindu of Nepalese ethnic who migrated in late 90s.
None. The only countries I know of whose official state religion is Buddhism is Cambodia and Bhutan.
Basically Buddhism although the official state of the religion is Drukpa Kagyupa
Buddhism originated in India, and it never caught on in India. Buddhism was then introduced in China, Korea, and Japan
Generally speaking, it is individuals who follow Buddhism, not countries. However, Buddhism is the state religion of Cambodia and Bhutan, and receives prominent mention in the constitutions of Thailand and Sri Lanka.
Tibetan Buddhism is state religion of Bhutan. More than 95% are Buddhisst and rest are ethnic Nepalese who migrated in late 90s practicing Hindu.