In a large, unprepossessing building near the bus station on the edge of Nairobi's Central Business District, several thousand people gaze captivatedly at Apostolic Bishop Margaret Wanjiru as she enchants them with tales of her conversations with the Almighty.

Several times a week for the past two decades, Wanjiru has been preaching to the congregation of her Pentecostal church, Jesus is Alive Ministries (JIAM), a thriving religious enterprise with branches in the UK, the US and Australia. A lowly