There have been Christians in India since not long after the appearance of Jesus Christ, I believe one of the apostles - Thomas - is said to have gone to India.
There is much more involved; Hindus are generally very tolerant of other religions, and Hinduism has many branches with varied religious practices anyway.
Many recent Christian sects have come to India and been very aggressive and offensive to Hindus, which is not exactly a nice way to preach love.
“(The Apostle) Thomas - is said to have gone to India.”
I doubt it.
:-P