The similarity between Shintoism, Mahayana Buddhism, and Hinduism lies in their shared belief in the existence of multiple deities or gods.
In Shintoism, the indigenous religion of Japan, there is a belief in the existence of kami, which are divine spirits or deities that can be found in various natural elements such as mountains, rivers, and trees. These kami are revered and worshipped in Shinto rituals and ceremonies.
Mahayana Buddhism, one of the major branches of Buddhism, also incorporates the belief in multiple deities. While Buddhism generally does not emphasize the worship of gods, Mahayana Buddhism includes the concept of bodhisattvas, enlightened beings who have chosen to postpone their own nirvana in order to help others achieve enlightenment. Bodhisattvas are often worshipped and revered in Mahayana Buddhism.
Hinduism, one of the oldest religions in the world, has a rich pantheon of gods and goddesses. Hindus believe in the existence of multiple deities, each representing different aspects of the divine. Some of the most widely worshipped deities in Hinduism include Brahma, Vishnu, Shiva, Lakshmi, and Saraswati.
Therefore, the commonality between Shintoism, Mahayana Buddhism, and Hinduism is their belief in and worship of multiple deities or gods.