Like Larni said earlier, in the UK, pretty much ALL schools are religious in nature.
The
public school system is run alongside the church. All are Church of England. The choice of school to which children are sent is more or less mandatorily decided by the local authority.
There really is no choice to NOT go to a religious school.
However I also have to agree that you need to be a little careful where and when you vent about your concerns. When all around you are either religious zealots or brainwashed church sheep, you need to keep it zipped no matter how hard that is.
In that sense there is a definite feeling of religious oppression in british schools.