What has the Rainbow Warrior bombing got to do with religion? That was a despicable political act, nothing to do with one religion or the other.

Since 1905 France operate under the separation of Church and State. Far from being a Catholic country, it is a secular state with a multitude of faiths most of them established other centuries of immigration (i.e. not recent immigration).

Now the Roma situation has nothing to do with religion. There are legal and illegal Roma camps in France. There was a Roma camp in the town I grew up in and they mostly did not cause problems apart from documented petty thefts. The kids did not attend any of the local schools and they regularly came to the doors to ask for hand outs or to refurbish furniture. They had elected to live in a field near the town council dump and would mostly be "recylcing" whatever was being dumped there. Once again the move against the Roma people currently happening in France is a political action which started after some riotting between the police and Roma youth:

http://www.bbc.co.uk/news/world-europe-11027288