When in Rome do as the Romans!
This means if you are visiting Europe you probably don’t want to talk about very much of anything. You should particularly avoid saying anything against Islam regardless of whether it is true. Europe has never had the same commitment to freedom of speech as the USA. Now, Islam has become a special class that cannot be criticized. So be careful what you say. I suspect it is fine if you want to criticize Christianity or Judaism, but who knows????
Well, there are supposedly around 8,5 million Muslims in France, so I am not surprised the court made this decision, as for criticizing other religions in Western Europe, I think that Christianity is the only religion people are allowed to criticize with impunity.