That's like saying the USSR should have stayed communist because Russians are communist. The indians who are catholic were force-fed themselves.
Since when is christianity a european religion, last I checked it is universal, and the one true religion.
No they are not. Perhaps some of their ancestors were, but this is now THEIR religon, and they have a right to practice it, no matter what someone thinks about about whether Indians shouldn't be Christian or not for whatever reason.