1
There is no founder for Shintoism
It doesn't teach anything, a marriage is a marriage.
There is know founder for shintoism.
Shintoism, Shinto
yes
Shintoism is the major religion in Japan.
The book A Thousand Splendid Suns can teach you a lot about Afghanistan. It can teach about marriage customs for example.
Jomon
The Halawali is the key text of Shintoism.
Shintoism is a spiritual practice in Japan
There are many religions that teach Polytheism which is the belief in many gods, Hinduism, Animism, Shintoism, and Traditional Folk Religions of different cultures.