Johninnit has a fantastic cartoon on the subject of teaching creationism in schools.
For myself I’ll be going to a variety of school concerts over the coming period and expect to hear a fair bit about the birth of Jesus. I don’t guess any will go beyond the bounds of what you’d expect from the story. And I know that my kids learn about other religions and their festivals in school and nursery.
I’ve yet to hear anything about atheism or agnosticism.