Zarin Havewala doesn't call herself a professional matchmaker, but her track record suggests otherwise. "So far, 55 couples have found their partners through my efforts — 53 couples are already married, and two more couples are engaged to be married soon," says Ms Havewala, a Mumbai-based mother-of-two. Ms Havewala is a Zoroastrian — or 'Parsi' (meaning 'Persian') as they're known in India — a member of an ancient monotheistic faith that pre-dates Islam and Christianity. Zoroastrianism was the official religion of Persia, its birthplace, for more than a millennium, but today the community is a fraction of its former size,...