In that case, I don't think there are any. Since yoga is a mind/body practice, references to the inner workings of the mind and spirit are typical.
If a Christian approach would work, I know there are some yoga-like videos from a Christian perspective, but I don't think there are any aimed specifically at children.
Maybe a book better fit your needs. My Daddy is Pretzel might work if you are willing to edit a sentence here and there. The Yoga Pretzel cards might also be appropriate, if you take out the cards that don't sit well with you, or edit them as you read the text.
If you want to put together your own series of movements to do with your kids, someone recently posted a recommendation for this book:
Yoga For You And Your Child. There are Like New copies available quite cheaply in the used page on Amazon.
This list on Amazon might also be helpful:
Great Resources for Kids Yoga.
Good luck!