Religious education is a case of lack of separation of church and state. But religion is kept out of the non-religious subjects in schools, by and large. Public schools are secular - that is why there is a market for religious private schools.

I also meen the attitude of both politicians and religious leaders. In Europe politicians are supposed to keep their religion private and Bishops are supposed to be nonpolitical. The opposite of the US where politicians sound like preachers and preachers are political.

If you are not convinced, try it on someone who has not been entirely debauched by economics. — Piero Sraffa