Buddhism in Japan began teaching devotion to the "Lotus Sutra". Eventually, his disciples formed their own school of Nichiren Buddhism, which includes various sects that have their own interpretations of Nichiren's teachings. Nichiren Buddhism established the foundation of Japanese Buddhism in the thirteenth century. The school is known for its sociopolitical activism and looks to reform society through faith. In the Muromachi period, Zen, particularly the Rinzai school, obtained the help of the Ashikaga shogunate and the Emperor of Japan, and accomplished considerable development. After the Sengoku period of war, Japan was re-united in the Azuchi–Momoyama period. This decreased the power of Buddhism,
Buddhism in Japan World War II, there was a high demand for Buddhist priests who glorified fallen soldiers, and gave funerals and posthumous names, causing a strong revival. However, due to secularization and the growth of materialism, Buddhism and religion in general continued to decline. Japan has seen a growth in post war movements of lay believers of Buddhism and a decline in traditional Buddhism in the 20th century, with roughly 100 Buddhist organizations disappearing every year. As of 2008 approximately 34% of the Japanese identify as "Buddhists" and the number has been growing since the 1980s, as Buddhists were 27% in 1984.