Pas de soucis!
For Black Africans: yes aboslutely, but it has changed imo: younger africans especially those growing up in the cités see Islam more and more as a "counter"-culture to the dominant "White/French" one with which they don not identify and that dscriminates against them. Add to that the War on Terror and the Palestine/Israël conflict and a lot feel this injustice and side with the perceived victim : Islam and the Muslims. Unfortunately, there are hardly any Black (American or otherwise) "causes" or "role-models" to follow, even just at a cultural level (2pac for example). But the Arab/Muslim world has provided that to some.
@Liu Kang answered and I'll add this: the debate about freedom of speech in France is ALWAYS going on, there's always someone who wants something to be forbidden (insulting political and religious figures -Charlie Hebdo was almost exclusively attacked in court by the Far-Right and the Catholics-), denying the Holocaust ever happened, comics going "too far" for some, etc. To my knowledge, amonh historical facts only denying the Holocaust and the Armenian genocide are punished by law, for the reason that Anti-semites and a certain proportion of Turkish (my gf is Turkish) stil deny today they ever happened. For example I never heard of anyone denying slavery happened. But again, it's not only the génocides that are protected by law, insulting a public figure in the media can be protected by the freedom of speech or not, dépends on the prosecution if a complaint is filed. What is forbidden is "inctitment to hatred", which includes good old racism and denying proven historical facts for propaganda purposes.
Again I'll just add to what @Liu said: one very important thing is that the vast majority of workers who immigrated to France (and Belgium) in the 50s and 60s were poor and marginalized in their own countries: we're talking about non-educated people living in the countryside mostly. Unfortunately it is often harder for those people to integrate, especially in such a different country. So many of them would just lay low and try to get by without making too much of a fuss. Now the following générations saw their parents be humble and take shyt, but they weren't gonna do the same because they are born HERE and are more educated. So the resentment is higher. Always understand that it's Young sons of immigrants who are radicalized, the older générations are much more open/easy to go with/don't really care about religion etc.