That's simply not going to happen. Not in the next 100 years.
Muslims are less than 15% of the population, with no power, and that's not going to change much in the coming decades.
India's diversity may have an Achilles' heel but it's not Muslims; it's the economic gap between rich and poor. Other countries have the rich/poor divide but, in India, as you mentioned, the different ethnic and linguistic factors exacerbate the problem.
India's stability in the long tun will depend on how this economic divide is handled.
P.S. Anyway, that's probably getting a bit off-topic.
I appreciate your insight as always.
Though personally, I have to say that I think Modi is the first step on an inevitable chain.
The British unfortunately were very bad about how they drew and created countries.
Just look at the border between Sudan and Egpyt for example, it's a perfect line and a perfect right angle. As if the British just picked up a ruler, and drew a random line.
Sudan of course split, it was never feasible to have a Black Christian south and an Arab Muslim north, that was simply a doomed British project.
Other British drawn lines such as the borders of Syria and Iraq have already de facto been broken, the controlled and administrated territory of IS covers large portions of what was once Syria and Iraq. As of now, new countries.
India already split before, in the first partition. Another badly drawn line by the British. But the 1947 partition line was also drawn by the British (or people working for the British), and the politics of the subcontinent are pointing towards the fact that it was again, a badly drawn line. Not just Indian Muslims but also Northeast Indians who are called "ch*nkis" by regular Indians, and possibly even southern Indians who think the Indian government helped the Sri Lankan government kill their fellow Tamils. Or Eastern Indians who share a similar problem to those in the NE, but are also swept with Maoists.
These all form massive demographic chunks, again a problem caused by having no truly dominant demographic group. The events playing out in the Middle East right now are not dissimilar in nature. Countries with borders drawn by the British, with large demographic groups at odds with each other. What did they think was going to happen?
I should say that Pakistan and Bangladesh were lucky to have split off the original British ruled-subcontinent, since they now ended up with dominant demographic majorities (Pakistani Muslim and Bengladeshi Muslim respectively), just as China has one dominant demographic group (Han Chinese who share culture/religion/ethnicity).
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Horus