Now regarding the conversion to Christianity, the lower castes have always been treated badly in rural India. So now here comes a missionary with a message that everything will change if you accept Christ. You can't blame them to converting, can you? You want to stop people from converting out of your religion? Treat them better. Religion is a business and like every business you have a product and a sales pitch. Christianity promotes itself as user friendly (accept Christ as your lord and savior and you don't have to do anything else), Islam promotes itself as the one stop solution (all the answers are in the Koran). Buddhism is promotes its as a solution for the more sophisticated, for the thinker if you will, like a designer brand (made in Nepal but marked up 20 times because of the name).
Now what's your sales pitch? You're like the businessman or woman who sits in his office and bitches and moans about the competition take business away from him or her but doesn't look inward to see that he doesn't have good marketing. Yours is extremely complex product with millions of pages of literature. You should concentrate of better customer support. Dalit getting beat up in a village? Have VHP run over there protect him. Lower caste can't access school? Go give him a ride. Most importantly make sure you leave a card so they know who's helping them because in the end, it's all about brand recognition and superior customer support in business. Because in the end that's what religion is, a Business. A business that take advantage of man's fear of his own mortality and the fear of the unknown hereafter.