To me, that doesn't sound as if he's violating any law. He's not introducing scripture or his beliefs into the curriculum.
Hopefully you and your children enjoy the Christmas and Easter holidays. Surely there would be no problem if y'all voluntarily gave those up, since they're based on religious beliefs.
If you're sending your children to be educated on "fact-based issues", they surely won't be in school very long...there's also lot's of interpretation, opinion, and assumptions that are being taught as well.