Why? You think much has changed in the last couple of years?

No, nothing has changed, it was a small problem then and it is now, you could post news from as many as 50 schools and it wouldn't change the fact that it is a small problem, and it was clearly addressed and will be addressed in the future:

"After the Charlie Hebdo killings, the education ministry was not taking any chances. Every school was instructed to make time on the eve of the moment of silence to explain the reasons for it."

What % of youth are Muslim?

What? So french will stop having children and 9% of Muslims will have sex with everything that moves for next 50 years? wtf does it matter how many young people are Muslims when total number is 9%? how about you tell me how many young people are not Muslims?

what % of the adult population of France hold opinions like those in the article

What is this based off of again? Teachers opinions on what children think? most children do nothing but repeat everything adults tell them.