Religion, if it is genuine, is so profoundly interwoven with individual thought and experience that it is no more exhaustible than consciousness itself. And fiction whose purpose is didactic is bad no matter whether the matter to be "taught" is Christianity or the world view of Ayn Rand. It seems often to be assumed by writers that religion is a pose, meant to deceive oneself or others, or that it is a bad patch on doubt or complexity. This is only convention, however. The writers I know have a much deeper engagement with the real issues of religion.