You're going to have a tough road their. A while ago, I read a bunch of Christian fiction aimed at teenagers because I was trying to get into a character's head. The only story I found where being gay was the main theme was a book called Bright Purple: Color Me Confused, by Melody Carlson.
Let's just say, it wasn't a very 'compassionate' book. There were a lot of selfish moments by the narrator whose gay best friend came out to her, ex-gay therapy was given a predominate place within the themes of the book, and almost all the gay characters are stereotypes of stereotypes. Although it ended with a message of hate the sin and love the sinner, the book had no interest in humanizing anyone in the gay population.
A slight editorial note: Pretty much anything by Melody Carlson isn't going to be that great. Most of it is flat and pretty poorly researched, especially her book, Finding Alice. I read it when I worked in a facility for schizophrenic individuals, and we passed it around and laughed at all the psychology mistakes.