The term "rice bags" is not from India but from the west where poor natives who are easily converted with small incentives are termed "rice bowl/bag" christians, meaning they are not true christians.

There used to be some kind of exclusivity in being a christian in India. This might no longer true.

I am from Chennai where Christianity has spread rapidly in recent years, a christian doctor who died of covid had to be cremated in a Hindu cemetery because of conflicts between the different christian denominations.

This has been the case in the North-east of India for several years now, since they are more than 80% christian.