Why do some Hindus want to force Sikhs to be Hindus. They are not. You don't even know what they call Hindus in punjab. They call Hindus as mootpeene or mootpeeni quam.( piss drinkers). Many of them believe Hindu religion is full of dhong and consider Sikhism as vastly superior to Hinduism.
As far as guru granth sahib is concerned where hindu gods are mentioned, they say that Ram, krishan doesn't refer to hindu gods but are entirely different person.