have my children's local schools taken away our civil rights by continually asking them to cross out the words Christmas and God on their sheet music?

On three occasions over two years with three different teachers, my children have been asked to cross out the words "Christmas" and "God" from the sheet music they learning from. I have spoken to the Superintendent after the second and third offense and she apologized and said she spoke with the Principals. After speaking the the Principal myself in December, it occurred again for the 4th time. This time my daughter was asked to replace "Christmas" with Hanukkah" on several lines in a song when performing to local groups in town. I have a very cordial relationship with the town. Serving the children of the town in many capacities over many years. We are also an interfaith marriage. thank you.