In 1857 it was the Bengal province which was one of the main centres of the revolt -- Barrackpore and the case of Mangal Pandey comes to the forefront .
It was due to this incident that the British who would principally recruit from "upper caste Brahmins" and muslims in the Bengal region( comprised then of undivided Bengal, Bihar , Orissa and part of Assam ) British researchers of the "debunked" martial race theory , began to stop recruiting from these regions and instead give designations of martial races to the ethnic groups which remain loyal during the revolt --like Sikhs , etc and recruit heavily from them instead.
It was also after 1857 , that systematic victimization of Muslims started and deprivation of opportunities in Government jobs etc.
In Later years ( 1900's ) this was reversed whereby Muslims were patronized and Hindus were ignored in keeping with their Divide-and-Rule strategy.
Appreciate your posts , dude ...but please stick to facts , regards...