I am going through this interesting discussion. I am of course enjoying and learning from this. There are two groups here one says Tribals are Hindu and other says they are not. I read some books where some say there is no religion like Hindu. This name is given by some non Indian researchers. In India people follow a way of life that is sanatan Dharma. We also found some write Dharma is not Religion.
Dear friends !!!!! Many people are not bothered on who is hindu and who is christian or who is musalman. I am among them. If religion is only matter of faith it is a matter of individual. When it matter of Mass-Faith it becomes something very complex. What many of us are convinvinced that one must live a life that goes beyond self interest and ego. That should be in pursuit of youth. What I am taught by my parents that there was no Arya or Dravidas. They showed me numerous examples where Arya means those wh are in quest of Truth and Light. I studied many of the writings of Sri Aurobindo a great philosopher and yogi of moden time. He also interpreted in the same way. I studied his book on Foundation of Indian Culture where he has narrated many examples and descriptions on Indian way of life. I also studied Swami Vivekanada, He did not agree with this Aryan and Dravidiayan concept. Many historians in India do not agree with that also. After reading postings of great people like you, we common people are finding lot of confusions.
After all, what will happen if we prove or disprove tribals are hindu. Will it make a way to bring peace and harmony in Kandhamal or other places of world where communal violence is persisting? Violence , hatred and facism etc are the practices of old human race who believed on animousity or animal instincts of human nature. Now we are definitely different from that race which has undergone several transformations in mind and life practices. Therefore there is no place violence, greed, hatred and all that goes against human prosperity and harmonious progress of spiritual life in society. I believe religion is term of past and spirituality is the term for present and future.