Well i've never lived in India i was born here, but i have visited India and i know for a fact that my relatives dissapprove and it irritates the crap out of my parents. Its the reason our relationship is so strained. Most of my hindu's i know here in America also frown on me and give me greif for it, so when i say that Indian Christians get grief from their non Christian counterparts perhaps its not all of them but in my personal expereince i get it a lot here and abroad.
It is a know fact these days that the net influence of Hindu extremist groups is higher in the US & UK than anywhere else(including India) & seek to promote a holier than thou image as far as their "faith" & "values" go.
One reason Hindus may frown on Christians is the fact that many Christians eat meat. Meat eating is certainly not a tenet of Christianity; in fact, many of the early Christians and many Christian saints were vegetarians, and in the early days of Christianity there were so many prohibitions on eating meat that less than half the days in the year was it even allowed.
As you well know, eating meat is soundly condemned in classic Hinduism.
Perhaps Indian-Americans frown at you because most of them seem to vote Democrat(for all the wrong reasons), and you vote Republican. Did that ever cross your mind?
Immigrants, especially legal ones from India, are often brain-washed by the 'Rats about the Republicans being all "racist", and "xenophobic". Most of them happen to vote Democrat as a result of these lies. However, the good news is that more and more Indian-Americans are seeing themselves better reflected by the Republicans, than by the amoral and decadent leftist 'Rats who only spread falsities for the sake of immigrant votes.
Even the Blacks are beginning to see this.
That happens everywhere, including here. Someone in the family converts to another religion and the family doesn't like it.