Eating human brains, burying one’s face in dead people’s ashes and publicly deriding the president of the United States as a ‘piece of shit’ are not among the activities usually associated with serious religious historians. But Reza Aslan is something else. An American academic born in Iran, brought up as a Muslim, converted to Jesus by the Jesuits and back to Islam through his own free will, he came to prominence following an interview on Fox TV to promote his book Zealot: The Life and Times of Jesus of Nazareth (2013).