Krishna is not only in Bengal. You can find him in Mathura, Dwarka, Tirupati, Badrinath, Udipi, Jagannath Puri, Majuli Island Assam, Kurukshetra, Srirangam. As Vinayaka said, everywhere. The same goes for Sikhs, Muslims, and those who worship Shiva and those who worship the Mother Goddess.
To begin with: 43 Religious Places In India | Holy Places In India 2020