No, the French government doesn't deny the existence of anthropogenic climate change. Nor does the US, China, or indeed virtually any major government or multinational corporation. Despite that fact, global CO2 emissions are still rising on an exponential curve. And all of these organisations are actively searching for more sources of fossil fuels at a time when science tells us we need to keep ~80% of known fossil reserves in the ground to avoid dangerous climate change
Climate denial-ism is a sideshow intended to keep you distracted. The media loudly promote a debate that doesn't really exist any more so that people can feel good they aren't a part of the evil climate deniers causing the problem. Liberals who loudly proclaim the importance of fighting climate change while doing everything they can to increase emissions have been far more of a threat to our climate than deniers for at least 20 years. When Obama gives another inspirational speech about preserving the environment for future generations everybody claps, and nobody bothers to mention the fact that the man has authorised an unprecedented increase in US domestic oil and gas production.
The COP conference in Paris will be little more than another sideshow intended to keep you distracted. We already know that there will be no legally binding agreements to reduce emissions and that the voluntary pledges countries are prepared to sign up to will likely lead to some 3-4C of warming even if implemented fully.
The reality is we live in a world that is gearing up for more, not less, fossil fuel use. Despite the loud proclamations of governments and media corporations to the contrary.
That is why protest is necessary and why the French government is actively suppressing dissent with these measures.