Please indicate exactly when religion entered the Santa Claus debate, and who put it there.
Santa Claus comes on Christmas. He came to my house.
This was not the time or place for her to advance her personal agenda. She shows poor judgement, and more than a touch of vindictiveness/bullying tendencies.
Seven year olds like to teach the six year olds there is no Santa. She has put herself on that level. (And the seven year olds get in trouble at home for doing so.)
Her rules of engagement with teaching are ridiculous. Teachers should teach the lesson plan, not their personal beliefs. There was no need to get into the existence or non-existence of Santa to recite this poem. This was a silly battle for her to fight, and reveals a strange person.
In some mixed religious homes, Santa even leaves presents under the Hanukkah bush. I don't know where he leaves the presents in the homes that celebrate Kwaanza. Maybe under the crack pipes?