Our Father who art in heaven,
hallowed be thy name.
Thy kingdom come,
Thy will be done
on earth as it is in heaven.
Give us this day our daily bread,
and forgive us our trespasses,
as we forgive those who trespass against us.
And lead us not into temptation,
but deliver us from evil.
For thine is the kingdom and the power, and the glory,
forever and ever.
Amen.
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You don't need to be "religious" to know this. (Though, when I was growing up, all kids knew this by heart.) Aside from religion, it's also a basic tenet of literature.
Reminds me: Back in the mid-2010s, I was at a Christmas dinner with the family. As it turned out, my two nephews, born in 2002 and 2006, had no idea where the concept of "Christmas" came from---because neither their parents nor their schools had ever bothered telling them. (How odd! Such a major holiday, and no one today telling the children why we celebrate it...)
I don't care if you're religious or not---at least teach your kids that today's Christmas holiday is based on Christ. (If you're extra-fancy, you can add that the holiday is derived from earlier pagan Winter solstice celebrations.)