It means well, but fails to do justice to its subject. A new exhibition at London’s School of Oriental and African Studies is an ambitious but flawed attempt to understand Zoroastrianism, which claims to be the world’s first monotheistic faith and the state religion of the first global superpower, ancient Persia. Both claims are shrouded in antiquity, but deeply embedded in the psyche of India’s tiniest and most successful minority, the Parsis.