Shintoism and Sikhism were both founded in the continent of Asia.
Asia
Shintoism is a traditional Japanese religion founded in Japan, while Sikhism is a monotheistic religion founded in the Indian subcontinent, specifically in Punjab, which is now part of India and Pakistan.
Sikhism was founded in Asia (India) but is practised in many continents eg: Europe, America
Buddhism, Sikhism
There are three predominant religions: Hinduism, Sikhism, and Islam, with Christianity in large numbers in certain pockets of the continent.
It is called Sikhism.
Sikhism
Sikhs believe in Sikhism.
Asia is a huge continent and would have all the main world religions like Christianity, Judaism, Islam, Buddhism, Sikhism, Hinduism etc.
Sikhs are the followers of Sikhism.
There were no mean leaders in Sikhism.