Narrative and Theology
has a nice, short and to the point, post about the uses and limits of narrative: "Power and Powerlessness of Stories
Because of his context, USA Anglican, it focuses on the Windsor report, but the points he makes could be made with even more justification elsewhere.
AKMA is particularly good demolishing much supposed theological argument in Church, and the misuse of story. So before your next effort at using narrative in theological argument (next week's sermon?) read the post. Having read, maybe like me you'll look forward to a balancing post from him on right use of narrative!