Yeah. So lets say the kid doesn't choose to accept Christ by 12 or 13 yrs. If all the other choirs require their members to be saved you would just tell the kid, "I'm sorry, but in order to get into the youth/teen choir you have to accept Christ as your personal Lord and savior. I would think one of two things would happen. Either the kid would accept Christ to be on the choir or the kid will get angry and just say ****w it. Either way how would you minister to the kid? It's hard for me to believe that a person who accept Christ just to be on the choir truly accepted Christ. While I'm not for caving for angry kids, that kid would need to be ministered to.
You make it plain to them when they are children. This way, when they become teens, there's no fuss. This is what the requirements are for membership in this group.
I'm not seeing the problem. If your church is preaching and teaching Christ, this really shouldn't be an issue. How can you have the glory of God rest in your sanctuary when the folks 'ministering' aren't on one accord?
You're doing the kid AND the church a disservice when you just put people in places for just any ol' reason. Perhaps, you should do without that particular ministry. *kanyeshrug*