Liberation theology?
How can Christianity become the majority religion in India under British rule?
Liberation theology?
Christianity - particularly a robust, muscular Protestant "mere Christianity" in a dissenter tradition (Methodist? Presbyterian? Baptist?) - as an alternative for the lower castes, including the "untouchables," to get ahead in a much more "British" Raj (i.e.
no princely states, at least not any Hindu ones).
The point is that to overturn Hindusim, one needs a HUGE economic dynamic to take people away from a faith with incredibly deep roots, both in terms of social organization, philosophy, politics, economics, etc. in South Asia as of the Eighteenth and Nineteenth centuries.
Accomodations with the smaller faiths - Islam, Buddhism, Sikhism, Jainism, even the Parsi and Jewish communities, and the animists - recognizing them as something very "different" than Hinduism will be necessary.
Then you need what amounts to a crusade against the varna system, notably the Brahmin and probably the Kshatriya castes as well. They you need the British to set aside the color line, which is going deep into ASB-land by the Nineteenth Century.
And you probably need a lot more "British" or at least European emigration to India...
Even then it would be really, really, REALLY difficult, I think.
Very different world than our own, of course.
Best,