Christianity in India

Christianity is third largest religion at approximately 24 millions of followers constituting 2.35%of population.
Christianity arrived India with the coming of Thomas the apostle during the 1st century.the second spurt in the growth of Christianity came during the colonization of India which started after the discovery of sea route to India by vasco De gama the Portuguese explorer in 1498.

christians-caste system

In the constitution preamble of India it was proclaimedthsat India is secular state. and the constitution ofIndia offers more provisions to its citizes about religious freedom in article 25.
IS scheduld caste people in India denied the religious freedom by the government ? yes, 62 years f independence India discriminating scheduld caste people to not adopt christianity. there was no religious freedom to SCs.
If any SC ndividual adopts christianity he was recognised as a backward class one. how it possible. can any body changes his caste by adopting other religion? is caste in india is determined by caste or religion? in some caste certificates issued by tahasildars they mentioning SC Christian as Christian caste! how it is possible.?
Caste is vested to a person by his birth. and religion is by his individual practice.If our government wants to devolop our nation with a penline It has to do it in minutes of time by issuing bc-c certificates.