How did the Radical nationalists add to the communal tension in India?

Some of the Radical nationalists actions led to the growth of communalism. Tilak organised Shivaji and Ganapati festivals. Aurobindo Ghosh considered India as mother and nationalism as religion. There was a certain tinge of religion in the political work and ideas of the radical nationalists. As a result, a large number of educated Muslims remained aloof or turned hostile to the National Movement.