HOW CAN SKEPTICS MAKE GREAT RELIGIOUS ART?

" Most of the modern novelists who have placed matters of faith at the center of their work have been, like Graham Greene, C.S. Lewis, François Mauriac and Flannery O'Connor, believers of one sort or another. But in every other branch of art, great works of devotional art have been created by skeptics, not a few of whom were fire-breathingly militant about their doubt..."