Are Indian Tribals Hindus?

Here is a wonderful article discussion whether India's Tribal population can be called Hindus or not:

http://indiafacts.co.in/are-indian-tribals-hindus-part-5/

https://www.scribd.com/doc/263041300/Are-Indian-Tribals-Hindus-By-Shrikant-Talageri

Complete article:

Are Indian Tribals Hindus By Shrikant Talageri