> lot of Southern states do not feel that "we belong to India"
Speak for yourself/Tamil Nadu. I'm from Karnataka (a southern state) and majority of kannadigas love India and are patriotic.
> worship "India's language is Hindi", "India's religion is the Aryan worshipping flavour of Hinduism" and other nonsense
Why do you believe that north indian language and religion are nonsense? I've lived in New Delhi for more than half of my childhood and I don't think North Indians are backward relative to South Indians. Although they are relatively poor.