Though I cannot give you an authentic source, according to my knowledge (obtained from various sources) the break-up is: Christians (all denominations) - 33% Muslims (all sects) - 17% Irreligious atheists - 15% Hindus and followers of other native religions of India - 12% Other religions: Rest
Probably you can get some info on this from Wiki also. The growth projection has no real meaning as such.
