Going back in Indian history, the Sikhs and the Hindus may have had their disputes, but when the Muslims invaded with their “convert or die”, they found the Sikhs to be a fierce opponent. The Sikhs are against forced conversion, and I believe that they are against proselytizing (correct me if I’m wrong. If I am correct, the Zoroastrians are the same way).
The first born of every Hindu family was given to the Khalsa to create the Sikh faith. Sikhism started as a non-violent religion like its predecessor Hinduism. However, after repeated massacres by Muslims, Guru Gobind Singh formalized the martial nature and symbols we associate with modern Sikhs today.
There is little connection between modern Sikhism and Hinduism today.