What you say will be true of some non-Christians.
But as a non-Christian I also find the Christmas story and especially the music associated with it very moving and personally rewarding. I've spent many years as a child and adult practicing and performing this music, know much of Handel's Messiah by heart (I sing the bass part on the Hallelujah Chorus at CP), and my very first choral concert as a fifth-grader involved a Candlelight Processional while singing the carol "O come, O come Emanuel". This music is an important part of who I am, and CP allows me to celebrate that.
In other words, I don't think the enjoyment is necessarily directly related to one's faith. I have no problem with you enjoying the performance on the basis of your faith, so I hope you can accept that others can enjoy it just as much in their own way.