105. Japanese Buddhism by open source:  

Buddhism arrived in Japan by first making its way to China and Korea through the Silk Road and then traveling by sea to the Japanese archipelago.^[8] As such, early Japanese Buddhism is strongly influenced by Chinese Buddhism and Korean Buddhism. Though the “official” introduction of Buddhism to the country occurred at some point in the middle of the sixth century, there were likely earlier contacts and attempts to introduce the religion. Immigrants from the Korean Peninsula, as well as merchants and sailors who frequented the mainland, likely brought Buddhism with them independent of the transmission as recorded in court chronicles.^[9] Some Japanese sources mention this explicitly. For example, the Heian Period Fusō ryakki (Abridged Annals of Japan), mentions a foreigner known in Japanese as Shiba no Tatsuto, who may have been Chinese-born, Baekje-born, or a descendent of an immigrant group in Japan. He is said to have built a thatched hut in Yamato and enshrined an object of worship there. Immigrants like this may have been a source for the Soga clan’s later sponsorship of Buddhism.^[10]

The Nihon Shoki (Chronicles of Japan) provides a date of 552 for when King Seong of Baekje (now western South Korea) sent a mission to Emperor Kinmei that included an image of the Buddha Shakyamuni, ritual banners, and sutras. This event is usually considered the official introduction of Buddhism to Japan.^[4][3] Other sources, however, give the date of 538 and both dates are thought to be unreliable. However, it can still be said that in the middle of the sixth century, Buddhism was introduced through official diplomatic channels.^[11]

According to the Nihon Shoki, after receiving the Buddhist gifts, the Japanese emperor asked his officials if the Buddha should be worshipped in Japan. They were divided on the issue, with Soga no Iname (506–570) supporting the idea while Mononobe no Okoshi and Nakatomi no Kamako worried that the kami of Japan would become angry at this worship of a foreign deity. The Nihon Shoki then states that the emperor allowed only the Soga clan to worship the Buddha, to test it out.^[12]

Thus, the powerful Soga clan played a key role in the early spread of Buddhism in the country. Their support, along with that of immigrant groups like the Hata clan, gave Buddhism its initial impulse in Japan along with its first temple (Hōkō-ji, also known as Asukadera).^[13] The Nakatomi and Mononobe, however, continued to oppose the Soga, blaming their worship for disease and disorder. These opponents of Buddhism are even said to have thrown the image of the Buddha into the Naniwa canal. Eventually outright war erupted. The Soga side, led by Soga no Umako and a young Prince Shōtoku, emerged victorious and promoted Buddhism on the archipelago with support of the broader court.

Based on traditional sources, Shōtoku has been seen as an ardent Buddhist who taught, wrote on, and promoted Buddhism widely, especially during the reign of Empress Suiko (554 – 15 April 628). He is also believed to have sent envoys to China and is even seen as a spiritually accomplished bodhisattva who is the true founder of Japanese Buddhism. Modern historians have questioned much of this, seeing most of it as a constructed hagiography.^[14] Regardless of his actual historical role, however, it is beyond doubt that Shōtoku became an important figure in Japanese Buddhist lore beginning soon after his death if not earlier.

Taoist traditions of immortality and becoming a xian made it to Japan in the times of early Buddhism, but Buddhism absorbed them. “[U]nder Buddhist influence,” these stories were “associated with certain ascetic monks who were devoted to the Lotus Sutra.”^[15]

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