The Art of Writing
The art of writing is the art of discovering what you believe
- Gustave Flaubert
I ran across the above as one of my "quotes for the day" and I find it has a strong ring of truth.
I would venture to say it is probably the same with all the arts. When you work at expressing yourself you discover what you believe. And, I believe, when you are a Christian, and live for the experience of God's love, then when you participate in the creative act you are constantly discovering God.
After all, we believe He is "everywhere and fills all things." Then, as a Christian, you should be able to learn to see God everywhere: even in the darkest of places, for even there the absense of His Glory proclaims his presence.
Thus for the artist who is also a Christian, more than discovering what you believe as you write, you are also discovering the point at which your belief system intersects with the Ultimate Truth. And as a creator of fiction, you discover as you write the ways in which God interacts with the world that you hadn't even dreamed of. You discover other people's perception of the Divine (or lack thereof) and it enhances your own appreciation of the work and wonder of God.