A father of two has revealed that he was sexually abused by the leader of a fundamentalist Christian church.When Alan Robertson, 50, was a boy, he was raped by James Taylor Jr, who at the time of the incident was the head of the controversial Exclusive Brethren.Mr Robertson, a mechanic from Cumnock in Ayrshire, Scotland, says that after an address at a Brethren meeting in the nearby town of Kilmar