Question

why shiva,vishnu and durga emerge as supreme god​

Answer 1

Answer:

Shiva, Vishnu and Durga as supreme deities came to be worshipped through elaborate rituals. At the same time, gods and goddesses worshipped in different areas came to be identified with Shiva, Vishnu or Durga. In the process, local myths and legends became a part of the puranic stories.

Answer 2

Answer:

because shiva had helped all gods by drinking poison and durga killed rakhshas and vishnu had its 100 avatars