that is somewhat what i was thinking originally. The main two characters the male from the pagan family and the daughter of a pastor. She teaches him about Christ he teaches her about the hidden desires of all mens hearts. He falls in love with her and as time elapses he turns more to her for guidance and love and relies less on the occult until at the end he completely forsakes witchcraft and turns to God.
this could work also, BUT, not to detract from your idea.........this "plot" is fairly over used in my opinion. Just saying, please do not be offended. Bad boy falls in love with good girl, rocky relationship, all the usual pit falls, and PRESTO bad boy becomes converted.........married............children...........white house picket fence......
Now, even a well used story line can be refreshing and entertaining, but wow is it hard work.