You seem to be arguing for autonomous free-will, which postulates that man's freedom is free of any sort of influence. But there are those who recognize that freedom of the will can not be understood in isolation from the man himself. Freewill choices are not arbitrary or capricious choices. A man's free choice reflects his own motives, wishes, desires, dreams, aspirations, and values. My freewill choices are mine, not only because I make them without coercion, but because I own them.
In a novel the characters in the novel are making free-will choices in that sense. Every free choice they make says something about them as an individual, revealing something about their motives etc. And the choices they make are understood within the context of the story. And, this is important also, the choices they make might not reflect the values of the author. Rather, we judge the values of the author based on how the story turns out. Is evil punished; are the good rewarded? What does the story, taken as a whole, reveal about the author?
I maintain that God is revealing himself through the story he is telling