Until a few weeks ago, no one had given much thought to the car park in Gurgaon, a satellite city to India’s capital, Delhi. But for the last few Fridays the dusty, litter-strewn patch of concrete has become a religious battleground. This week as a Hindu nationalist mob assembled in their usual saffron, roars “Jai Shri Ram” (Hail Lord Ram) and “hail the motherland” filled the air. Then a cry rang out: “The Muslims are here.” And the mob began to charge. For more than a decade, this car park has been one of hundreds of sites that the Muslims...