Shintoism

That's because Shintoism and Buddhism are practiced in their daily customs instead of as their religion.

More than seven decades after the big war, Japanese still do not tend to Christianity. I think that Japan's Shintoism is like India's Hinduism. These religions just absorb foreign elements. Some Hindus believe that Jesus Christ was an incarnation of Vishnu. He may be one of the "kami" in Shintoism.

After World War II, Koreans turned away from Shintoism, animism which originated from Japan.

The origin of the Doll Festival reaches back to the crude days of Shintoism.