I`ve heard some of my close friends saying that most of the Christians in India are a result of British spreading their religion here. Even I didn`t know how Christianity came to India!!
Recently, I found an interesting article in the net & thought I`ll share it with you guys :-)

Is Christianity in India a European Contribution?

Christianity came to India long before America was found out, and even before many European countries became Christian. Many people in the West are misinformed that Christianity in India is a European contribution. However, in fact, Christianity in India is as old as Christianity itself, and it was brought to India by a disciple of Christ himself. The people who know about the early Church in India have other questions: "How can the apostle Thomas come to India when there were not much transportation facilities?"
Apostle Thomas - St. Thomas, one of the twelve apostles of Jesus Christ, came to India in 52 A.D., and landed at Kodungallur on the Malabar (presently Kerala) coast. He preached the Gospel to the Brahmin families of Kerala, many of whom received the faith. He established seven Churches there: Kodungallur, Kottakkavu, Palayur, Kollam, Kokkamangalam, Niranam and Chayil. It is also a tradition that he frequently visited Malayattoor hills for prayer. Later, he moved on to the east coast of India. He was martyred in 72 A.D. by a fanatic at Little Mount (near Madras) and his body was brought to Mylapore (near Madras) and was buried there. His tomb is venerated until this day.

"How can the apostle Thomas come to India when there were not much transportation facilities?"

Trade Relationships
Extensive trade relations existed between Malabar and the Mediterranean countries even before the Christian era. The numerous golden coins of the Roman Empire which have been found all over the south, as well as many recent discoveries, offer abundant proof that Roman trade centers existed along the southern coasts of India. While King Solomon was ruling over the Israelites (B.C. 970-930), his warships brought back to his country valuable merchandise supposed to be from Muziris (Cranganore), a defunct international port of Malabar. While discussing the dealings of the Phoenicians with Muziris, the Roman historian Pliny (A.D. 23-79) complained that every year they were sending large sum of money to India for silk, pearls, gems and spices. He also remarked that the Malabar ships were visiting the Persian Gulf, Aden, the Red Sea and Egypt. Pliny, Ptolemy (A.D. 100-160) and the Periplus of the Erythraean Sea give much detailed information about the trading centers of Malabar. Diplomatic relations between India and Roman Empire existed even before the Christian era.

- http://berchmans.tripod.com/apostle.html