Shintoism and Sikhism were both founded in the continent of Asia.
Asia
Sikhism was founded in Asia (India) but is practised in many continents eg: Europe, America
Buddhism, Sikhism
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.
There are three predominant religions: Hinduism, Sikhism, and Islam, with Christianity in large numbers in certain pockets of the continent.
Asia is the continent with the most different religions including Hinduism, Buddhism, Islam, Christianity, Sikhism, and others. This diversity in religious beliefs can vary significantly by country and region within Asia.
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.
There were no mean leaders in Sikhism.
Sikhs are the followers of Sikhism.