When Shintoism began
Shintoism began in 500 BC ,the tradition existed as a combination of nature of worship fertility rituals , and Shamanism. In the 8th century ,Shinto and Buddhism were considered the official religion of Japan.
Kami are spirits. Shinto does not have a god ,scriptures ,commandments ,or founders. Shinto has a priesthood ,which does not ,however ,follow rigid structure like priesthood of other religions.
Shintoism religion is Ethnic.