Final answer:
Shinto was adopted as the state religion in Japan during the Meiji Restoration of 1868, reinforcing national identity and traditional values.
Step-by-step explanation:
The state religion adopted in Japan during the Meiji Restoration of 1868 was Shinto. Although other religions such as Buddhism and Christianity were present in Japan, Shintoism was emphasized as an element of national identity and a way to distinguish Japan from Western influences and to restore traditional Japanese values.