Well, if your child attended the school, I presume you would know ahead of time what the program would entail and would have made your thoughts on the matter known. If you were then informed that they prohibited Christmas songs that mention Jesus, THEN I would say you had a complaint.
So far you're over-reaction appears baseless and nasty (not the image I would guess you are seeking to present).
Anyone ever tell you where presumptions can lead? As for your judgement on my "over-reaction" May I suggest you remove the log in your own eye before attempting to remove the spec in mine.