So, I used to be an avid reader of fantasy/sci-fi fiction. In fact, when I was a teen many moons ago, I was almost never without a fantasy novel in my hands. I've read five hundred fantasy novels, at least. Piers Anthony, Terry Brooks, Stephen R. Donaldson, Tolkien (of course), Tad Williams, Isaac Asimov, C.S. Lewis, George MacDonald, Orson Scott Card, Guy Gavriel Kay - the list goes on and on. But as I've grown older and more mature in my walk with God, the attraction of fantasy/sci-fi fiction has waned significantly. As I desire and pursue a holy, Christ-centered life, I find the immediate consequence of doing so is an ever-increasing and natural separation from the world - from its philosophies, values, entertainments, morality (or lack thereof), and preoccupations with money, power and self-gratification. Most fantasy novels reflect the values, and philosophies, and morality of the world and so, as God works to separate me more and more unto Himself (holiness), the novels that are occupied with worldly matters cease to be of interest to me. It's not that I'm turning into a monk, forsaking the world physically, but that God is just more interesting, more important, more true than fantasy. The deeper I go with Him, the sillier and emptier the stories I once enjoyed become. The richer my fellowship with God is, the poorer and more foolish seem the fictions that once absorbed me.
My story is not unique. God is bigger, wilder, more delightful, more amazing, than any work of fiction, and those who are walking rightly with Him know it. As He grows in priority in a person's life (as He should), He pushes out all the stuff that competes with, or in any way diminishes, Him in a person's life. When I see professing Christians, then, caught up in being eager fans of sports figures, or movie characters, or actors, or musicians, or figures from books, I recognize a heart divided, a heart that is not yet truly possessed of God.
"For to me to live is Christ..." (Philippians 1:21)