'Drink, drugs, sex, career, travel - I’ve tried it all. Nothing satisfies like Jesus Christ'

Calum Mackenzie grew up in a Christian family, but walked away from faith while at university. During the next 22 years he tried everything the world could offer, but nothing seemed to satisfy him. Until one day, a desperate expletive-laden prayer changed everything

My dad was a criminal and football hooligan who spent time in prison. He was a drunk and very verbally abusive. But when I was six years old, a Christian – who was also a former criminal – gave him John’s Gospel. Dad read it in one night and, within a week, he had completely changed. Because of that, my mum became a Christian too.