Even his Hinduism is no guarantee of majorityhood, because his caste automatically places him in a minority as well. Or take language. No language enjoys majority status in India. Thanks in part to the popularity of Bombay's cinema, Hindi is understood, if not always well spoken, by nearly half the population of India, but it is in no sense the language of the majority. Indeed, its locutions, gender rules and script are unfamiliar to most Indians in the south or northeast.
Ethnicity further complicates the matter.
Most of the time, an Indian's name immediately reveals where he is from and what his mother tongue is. When we introduce ourselves we are advertising our origins. Despite some intermarriage among the elites in the cities, Indians still largely remain endogamous, and a Bengali is easily distinguished from a Punjabi. Such differences among Indians often are stronger than what they may have in common. A Brahmin from Karnataka shares his Hindu faith with a Kurmi from Bihar, but the two diverge completely when it comes to physical appearance, dress, social customs, food, language and political objectives.