I was a musician growing up, and if Bach or Mozart's masses, or Handel's Messiah had been removed from the curriculum, it would have meant an unbalanced musical education. Further, much African American music is religiously based.
The guidelines that most music educators are supposed to use look like this:
GUIDELINES FOR MUSIC EDUCATORS
Music educators should exercise good judgment in selecting sacred music for study and programming for public performances. During the planning phase of instruction or programming, the following questions should be considered by each teacher in determining if a program is acceptable.
--> Is the music selected on the basis of its musical and educational value rather than its religious context?
--> Are the traditions of different people shared and respected?
--> Is the excessive use of sacred music, religious symbols or scenery, and performance in devotional settings avoided?
--> Is the role of sacred music a neutral one, neither promoting nor inhibiting religious views?
--> Are all local and school policies regarding religious holidays observed?
--> Is there understanding of the various religious beliefs and sensitivities represented by the school-children and parents? These come from the Wisconsin Music Educators' Association, but Fundy-lovin' Colorado has similar guidelines. You might want to have a conference with the principal, the music teacher and (perhaps) a member of the clergy who is supportive of the separation of religion and government (check with Americans United or the Unitarians for locals) and any other parents who were concerned about the religious nature of the program. Refer to the guidelines as above (and available here:
http://www.wmea.com/about/relig_pos.html) and remind the teacher and the principal that it is YOUR responsibility and right to educate your child about theological matters, not the school's, and that you do not delegate it to them.
Pcat