What is the date the religion began?
The date of when the Shintoism began was 1000 B.C.E
Who started the religion?
They have no founder of the religion of the Shintoism.
Who usally practices this religion and in what part of SE Asia?
The Japanese people and in japan.
What do they believe in?
They believe in polytheistic, the after life, and they also believe that the god Tao is immortal.
Are they polytheistic or monotheistic. (If they have more than 1 god who are their god(s)?
They are polytheistic and they have more than 1 God.
Is this a religious group or an ethnic group. How do you know?
They are religious because they have more than one God.