He is widely touted as a possible future prime minister of India, but he is a pariah in much of the Western world. Some in India call him a role model, their country’s most competent leader. Others accuse him of being complicit in the mass murder of Muslims. Narendra Modi is probably India’s most complex and divisive figure, a man whose rise could kick-start the economy but whose Hindu nationalist leanings would polarize the country along religious lines and potentially, critics say, undermine the long-cherished secular identity of the world’s largest democracy and a key American strategic ally.