Not fair to say. I am not Christian. Christmas is Christian. My husband was raised Jewish. It has always felt like our cultures were unimportant and we were forced to participate in something we didn't want to. Like it or not, it's harmful to some kids. You never know which ones.
The Elf is ties to the secular celebration of Christmas. Yes the Winter Holiday does originate from Christian celebration. However over time X-Mas to any non Christian has become a secular thing. The Elf is no more a religious symbol then Frosty the Snowman