First, In Orissa where there was huge starvation, these missionaries offered food in return for conversion, of course our govt. failed but can you ignore how they got these desperate people converted. Any parent will accept any religion if he/she sees his/ her child dying of hunger.
As for caste system, ask any South Indian, they will tell you that even after converting into Christianity, they follow it. So caste system problem doesn't go away with religion change.
Secondly you said they are not converted on gun point. Of course not. They use desperation and need of poor people to carry out conversion.
You say the people do it on their own will. Well same argument can be said on number of terrorists in Pakistan, they are not inducted on gun point, its their own will to kill innocent people. Its your govt. failure too that couldn't provide education and employment to these population which made few people to be brainwashed by the terrorist leaders and offered money in return of bombing.
I agree there has been criminal acts against Christians, but tell me one country where there is no religion, race, based crimes don't happen especially in our sub-continent. Even in your country people are shot just because they ask for proper trial of woman blamed for blasphemy and the murderer is showered by flowers by Lawyers, the lawyers who are supposed to fight for against injustice.
I agree there are many shortfalls in my country. I don't deny that. But also note that even with 81% Hindus in this country, Muslims and other minorities are growing every single day. They have important positions at all levels, from business, politics, government, bureaucracy, entertainment, science, sports, etc. any field.
I studied in a school run by Christians, prayed their prayers, even the Muslim, Sikh, Jain students did, and never saw any problem based on religion. Not a single iota.
We are population of 1.2 billion people, 1/7 of total population in the world. Do a comparative analysis, 1,2 billion Indians and around 6 billion rest of the world. Let me know what is the economy size, crime rate, terrorist attacks, crimes on base of race, color, creed, religion etc.