Regional or religional barriers are virtual in nature..what's REAL is the mountains the oceans n dessert that fence our land...separates us from the rest of the world.
The bounds of state get necessary, otherwise it wud've been difficult to form teams to play in the Ranji Trophy...on a serious note..India is ONE.
India is a magnificient and diverse country. For me all Indians are one. Rest of the world has admitted that Indians are really great and have ability to rule world.