There is, understandably, a cultural Christianity, usually visible in hymn singing, an annual nativity and learning bible stories in RE, but these things are not damaging. They don't stop children from growing up open minded and capable of deciding what they believe for themselves.
I would argue that they are harmful, but even if I put that aside, do
they do any good?
Why is the focus just on Christians? Why not ask how Muslim parents ensure their kids learn about other faiths. Or Jews, etc. Why attack Christians? The intolerance directed at Christians is shocking.
When you come from a place of privilege equality can feel like persecution.
I 'pick on' Christians because they have places in the house of lords, because, 'Christian worship, is compulsory in schools, because I don't see why shops have to close early on a Sunday, and I'm old enough to remember when they didn't open at all.
I will also pick on Christians because as a teacher they can legally discriminate against me when I apply for a job.
I know other faiths can do this, but the local Sikh school doesn't.
When parents apply for a school place they can end up with a child in a Christian faith school, I've not come across any child being allocated a Jewish or Muslim school.