Emperor Tenmu had Daikandai-ji Temple [later Daian-ji Temple] built and Emperor Jito had Yakushi-ji Temple built. Such movements reached a peak during the reign of Emperor Shomu.
Nara Period
In accordance with the development of Buddhism in China and Japan, the 'soni-ryo' or Monks and Nuns Act, which determined the regulation of monks and nuns [not of Buddhism itself] was introduced as part of Ritsuryo law. However, it is interesting that, while in China the priesthood was persecuted for opposing Confucian ethics by destroying the order of the 'family', in Japan it was incorporated into the bureaucracy through the 'soni-ryo' and the Sogo [Office of Monastic Affairs] and official certification system under the concept of 'nation protection' [priests with ranks such as 'Sojo' or 'Sozu' were government officials, or 'sokan', literally 'priest officials', under the Ritsuryo system]. In addition, it is also thought that such regulation was different between official temples built by nation and private temples built by nobles and common people. It is controversial how regulation against the latter was implemented.
As a result, the Sanron, Jojitsu, Hosso, Kusha, Ritsu and Kegon sects, known as the 'Nanto Rokusho', became dominant. In addition, Emperor Shomu abdicated in favor of Emperor Koken and became a priest. Emperor Shomu, influenced by Empress Komyo, was deeply religious. Therefore, he ordered the construction of provincial monasteries and nunneries and had the statue of the Buddha Vairocana [Birushana in Japanese] made in Todai-ji Temple, a provincial temple in Yamato Province. The retired Emperor Shomu became a priest and even called himself 'a servant of the three treasures'. As Buddhism became established, there arose the theory of 'honji-suijaku' in which Japanese gods were held to actually be incarnations of Buddha. The 'honji' [true form of the Buddha] for various gods were decided upon and sometimes images of gods were based on monks. However, as Buddhism gained popularity, the number of priests who ignored religious precepts increased, so that Jianzhen was invited during Emperor Shomu's reign. Jianzhen set up a 'kaidan' [ordination platform] at Todai-ji Temple and gave precepts to priests. The Emperor Shomu was also given precepts by Jianzhen. Jianzhen had the Toshodai-ji Temple built and lived there.
Heian Period
Kamakura Period
In the Kamakura period, disturbances which had continued from the end of the previous period resulted in a change in Buddhism. Although mainstream Buddhism had emphasized ceremonies and study for the nation and nobles under the name of 'nation protection,' it gradually changed to emphasize salvation of the common people. Centered on the priests who studied at Mt. Hiei, a popularization of Buddhism popular was planned and new sects were established. Unlike conventional sects, these sects preached a simple teaching ['igyo', literally 'easy progress'] which could be practiced by lay believers in their spare time instead of difficult theories and severe ascetic practices. These sects included the Nichiren sect, which taught that people could find salvation by reciting the nenbutsu [Buddhist invocation] 'Nam Myoho Renge-kyo'; the Jodo sect, which taught that people could find salvation by reciting 'Namu Amidabutsu' continuously [Invocation of the Buddha's Name]; the Jodo Shinshu sect [the Ikko sect], which taught Akuninshoki, a teaching that 'if good people, that is, pure people without any Bonno, or earthly desires, can be reborn in the Pure Land, how much more so for evil people, that is, people with Bonno'; the Yuzu Nenbutsu sect, which recommended reciting the nenbutsu while dancing; and the Ji sect. In this way, a flood of new sects appeared during the Kamakura period. These sects had all been suppressed by conventional sects until they had become established but, at the same time, they led innovations in the old religious sects. Even amidst all the denunciation, Nichiren of the Nichiren sect was famous for his radicalism. Since it criticized other sects and insisted that the nation would be ruined without reciting the Nichiren chant, it was strongly suppressed by the shogunate. However, after it spread down to the common people, this suppression was gradually reduced.
The Kamakura period was a time when the samurai were usurping power from the nobility and gradually gaining strength. In this period, the two Zen sects of the Rinzai sect and the Soto sect were introduced from China one after another. Since these sects were favored by the increasingly powerful samurai, many Zen temples were built in Kamakura and other places, where they flourished. Among them, the five major temples were called the 'Kamakura Gozan Temples. 'In addition, Kokan Shiren wrote "Genko shakusho", a history of Buddhism.
Moreover, criticism of the existing situation increased among conventional Buddhism sects. Some sects, in particular the Ritsu sect and its off-shoot the Shingon Ritsu sect, were even more reform-minded than the new sects, for example, not only did they participate in the salvation of the common people through social work but also rejected the state-proscribed kaidan and began their own original 'jukai' [handing down the precepts] ceremonies.
Northern and Southern Courts period to Muromachi period
The Soto sect was influential in the provinces and among common people. The Nichiren sect spread amongst the merchants and traders of Kyoto. In addition, Rennyo of the Jodo Shinshu sect and Nisshin of the Nichiren sect were famous propagandists of the time. Later, the Honganji Kyodan organization, which was revived and established by Rennyo of the Jodo Shinshu sect after overcoming obstructions from Mt. Hiei amongst others, set up a powerful lay organization called Monto, which came to be equal to the sengoku daimyo [Japanese territorial lord] who replaced the shugo daimyo after the Onin War. Moreover, under the name 'Ikko sect' [although 'Ikko sect' can also refer to sects other than the Jodo Shinshu sect] and united by faith, they reduced the power of the traditional shugo daimyo. Most notably, the well-known uprisings [Ikko Ikki] by Ikko sect followers, such as that in Kaga Province put pressure on the shugo daimyo and led to expanded autonomy [mainly in jurisdiction and the right to collect taxes]. For this reason, sengoku daimyo who hoped to expand their control, were forced to choose between compromise or conflict with these groups, with most of them choosing to compromise.
Among the Ikko Ikki in various provinces, Gansho-ji Temple in Nagashima, Ise Province in particular fought against Nobunaga ODA with great tenacity. Later, Nobunaga slaughtered the inhabitants and destroyed the temple. Moreover, Ishiyama Hongan-ji Temple, the headquarters of Ikko followers, grew into an organization that was a strong as the sengoku daimyo families. However, during Kennyo's time, it became mired in war, [known as the 'Ishiyama War'], for ten years [including a ceasefire] and withdrew from Ishiyama. Additionally, in Mikawa Province, where Ikko followers were especially powerful, they were suppressed by the young Ieyasu TOKUGAWA, causing a conflict that split the movement in two. There is also a famous story that Nobunaga ODA held a religious debate [known as the Azuchi shuron] between priests of the Nichiren sect and priests of the Jodo sect, declaring the Jodo sect the winner. It is said that in this debate he handed down a judgment favorable to the Jodo sect because he was tired of the aimed Nichiren sect's conflicts with other sects.
Azuchi-Momoyama Period
Edo Period
Ieyasu TOKUGAWA, who seized power after the death of Hideyoshi TOYOTOMI, regulated Buddhism by enacting the 'jiin shohatto' [temples law] and assigning jisha-bugyo [magistrates of temples and shrines]. In addition, under the 'terauke seido' [temple guarantee system], people were forced to register with any temple. The results of this can be seen in Buddhism's position as the primary religion for performing funerals. Ingen, who came to Japan from Ming China in 1654, spread the Obaku sect. Taking advantage of a succession dispute within the Jodo Shinshu sect, which was the largest Buddhist sect at the time, he made it split into 'east' and 'west', which resulted in the weakening of the sect.
Meiji Period
In the latter part of the Edo period, the study of Japanese classical literature was begun by Norinaga MOTOORI, which led to the Meiji restoration. The Meiji government, which was influenced by the study of Japanese classical literature, was established by people from the former Choshu Domain. For this reason, the restoration of imperial rule and the transfer of political power back to the Emperor saw the new government introduce policies promoting Shinto, which together with the nationwide anti-Buddhist haibutsu-kishaku movement, led to a decrease in the number of temples. In 1871, the Meiji government issued a 'Dajokan tasshi' [Grand Council of State proclamation] abolishing the Fuke sect to which the mendicant 'komuso' monks belonged. In addition, the propagation of Fuju-fuse School, whose members believed nothing should be received from [fuju] or given to [fuse] those of other beliefs, and Christianity was legalized. Each Buddhism sect promoted modernization and undertook social welfare work and educational work such as establishing universities.
Showa Period to Today
The modern government had controlled religion by Daijokan proclamation, fragmentary laws and regulations, and administrative notifications since the Shinto and Buddhism Separation Order. The Religious Organization Law of 1939 was the first integrated law. In the process of establishing the State Shinto system, shrines were treated under public law as artificial corporations rather than religions. However, religious bodies such as Buddhism, Sect Shinto and Christianity were not treated as public interest corporations under civil law. The necessity of a law on religion was also recognized in political world. The first draft law on religion was proposed in the House of Peers in 1899, but was rejected. Another draft law of religion was proposed to parliament in 1927 and 1929, but they never got to the debating stage. With the enactment of the Religious Organizations Act, general religious groups became legal entities for the first time and Christianity also gained legal status for the first time, but it was a very restrictive and controlling law.
After World War II, the Religious Corporation Ordinance was established and enforced on December 28, 1945, and the regulations on religious corporations were abolished. The Religious Corporation Ordinance was abolished in 1951 and the Religious Corporation Act, which introduced a certification system, was established. The Aum Shinrikyo incident triggered amendments to the Religious Corporation Act in 1995.