Hindu nationalism is certainly way different, it is an umbrella term that encompasses all Indic cultures, tradition and systems that have evolved for thousands of years.

This is against a mostly one book, one god/no god, one agenda and one power centre ideology being enforced on the people - Marxism, Christianity, Islam, "Atheism", "Feminism"

Especially in a country with a million gods and small unique communities, it falls on the government to protect them from ideologies with a track record for violence and genocide.