Out of interest, how along ago did mixed secondary level schools become normal in Spain? Thirty  years ago there would have been very few in Ireland.

Very interesting point here, Migeru.
Since the beginning of the 20th century, religious practise in France is supposed a strictly private matter and thanks no Jules Ferry, state (ie public schools) deliver the same instruction to all pupils, whatever their religious mainstream.
If parents want their children to have a religious education as a part of the school or high school program, they are free to send them to a private school.

The cornerstone of all this is the French concept of laïcité.

When through hell, just keep going. W. Churchill