Why do we have storytellers? Because we are created in God's image. The Bible is His Story and the most important of any story. The content of God's story encompasses all truth. He used individual writers and their personalities to collect His Story for believers.
Today God's Word is complete. We add nothing to it. Those storytellers who live for Christ, reflect threads of His Story in their written and oral tales. God's plot began in Genesis and His Story continues to this day. We are part of His Story. He works in and through us as writers.
God continues to use the individual personalities of those who know Him as storytellers. Many cultures do the same, but not every individual's stories reflect the truth of His Story because not every writer or storyteller knows the truth. Christian speculative fiction offers one more viable vehicle to tell a story threaded with truths from His Story. We are reminded in 1 Timothy 6:17-29
Instruct those who are rich in this present world not to be conceited or to fix their hope on the uncertainty of riches, but on God, who richly supplies us with all things to enjoy. Instruct them to do good, to be rich in good works, to be generous and ready to share storing up for themselves the treasure of a good foundation for the future, so that they may take hold of that which is life indeed.
As storytellers who enjoy fantasy, Science Fiction and speculative fiction, Christian authors who write in these genres use their talent to share His Story. It's not only a means of expression, but also a good work. A way to share the importance of taking hold of that which is life indeed.