We are all familiar with the story of the prodigal son, though that is not a story about religious conversion. Still, one would think there was enough in the Bible to remind us that where there is life, there is hope, when it comes to a person becoming a Christian. And even if someone began in the faith, and then backslide or even repudiated it for a while, why should we assume that such a person is beyond hope, beyond help, beyond a return to the Lord? Now this sort of coming and going is understandable from a human point of view, but it would be hard to explain from a deterministic one (did God really pre-determine a person to be a Christian early in life, then commit apostasyand write books attacking Christianity, then return to the faith?). Whatever your view on such matters the story of A.N. Wilson is both an interesting and compelling one. Here is a link to his story. See what you think, and reflect.
http://www.dailymail.co.uk/news/article-1169145/Religion-hatred-Why-longer-cowed-secular-zealots.html