When you call firefighters to your neighborhood and then attack them at ~60s with any kind of weapons,you can expect people to be angry,and then do acts like they did against a prayer hall. (Who,BTW,was illegal,because they occupied a hall for religion purposes.)
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If i enter a public place,showing my neclace where there's cross on it,someone will come to tell me to hide it,or to remove it. Same goes for a Jewish wearing a Kippa or a muslim wearing a veil that hide the face. The French state sees no "Religion is above the other's" or "This religion is so bad,so we will make laws against them".
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You conform to it,or leave it.
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What don't you understand in secular ? France isn't named "The Christian Republic of France",it is called "French Republic." (République Française).
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Your religion is a personal thing,nobody gives a sh*t,don't show it in public,don't make others to "accomodate" to your beliefs.
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And THEN you'll live peacefully,everyone i'd say.