Kippas are banned as well I’d be surprised if that is enforced, but I have a german viewpoint on this and we tend to be a bit touchier with restricting jewish habits than other countries. So it could very well be that only christians get to wear their crosses.

That is not a quote of mine, I don't know how that got in here. I'll answer your question, though.

One interesting thing would be the traditional hair style jewish males might display. I’m honestly interested where you stand on that.

I would order them to wear some kind of hair cover in order not to show this. <- A joke, as I feel like I have to clarify. There's not much to be done about this. If I'd notice an increase in wearing of the hairstyle if wearing the Kippah is banned, I think a ban might be in order (as there's substitute signalling). Of course that way I would get a bit pity.

This strikes me as a bit odd. You don’t want to allow people showing that they belong to a certain religion but you want to allow people to openly criticise peoples religions? It’s still communication about religion but just in a different way right?

That's my personal opinion. I think everybody must be able to say anything. Nobody nor no religion can be exempt of ridicule. Obviously if people take offense or seek difference in treatment over religious grounds then a problem occurs. Thats why the seperation of church and state was so rigidly written into French law. If that is what it takes, and if students fail to observe the decency of abiding by those rules on their own account they should be held in contempt of the institution.

The vast majority of muslims are peaceful people just like the vast majority of christians and atheists are peaceful people.

Agreed. And I subscribe to the idea of treating everybody favoribly and according to the same rule. Unfortunately laws are usually written to apply to the worst kind of people. I think in most cases it's not the students that are the source of the problem. I think the (self)isolation of the moslim population has something to do with it and the ideas of modern education are at odds with that. This is very unfortunate, I lament the downfall of the Islamic Golden age...