The Pew Survey on India is long. Here are my main impressions/surprises:
– The strong emphasis on Hindi in the Gangetic plain is pretty striking (“Central”)
– The stuff about mass conversions to Christianity in South India seems overdone. I understand people can/will lie on Census due to reservations, but this seems less plausible for a pollster. That being said, a disproportionate number of conversions are in the South
– South India is less religious, less nationalistic, etc. This seems to apply across religions (that is, Muslims in the South are less focused on religion just like Hindus in the South are)
– Opposition to “inter-caste” marriage is very strong. And, it is strong among non-Hindu groups too
– All Indians seem rather nationalistic