One great Christian fictional book is 'The Chronicles of Narnia' by C.S. Lewis. It weaves Christian themes into a magical world full of talking animals and epic adventures. Another is 'The Pilgrim's Progress' by John Bunyan, which is an allegory of the Christian life journey. And 'Left Behind' series by Tim LaHaye and Jerry B. Jenkins also has a large following as it presents a fictional account of the end times from a Christian perspective.
Sure. 'The Screwtape Letters' by C.S. Lewis is quite interesting. It's a series of letters from a senior demon to his nephew, providing a unique view on Christian virtues and temptations. Also, 'Hinds' Feet on High Places' by Hannah Hurnard is a wonderful story about a character named Much - Afraid and her spiritual journey. And don't forget 'This Present Darkness' by Frank E. Peretti, which delves into the spiritual battle between good and evil in a fictional small town.