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From the Enlightenment to the Romantic period, many writers transformed Christianity into a religion of temporal salvation. Whether they manifest, in their writings, a will to destroy it (Voltaire, Helvetius, d'Holbach, etc.) or to surpass it (Leroux, Lamennais, Hugo, etc.), all refer to its dogmas as a paradigm of argumentation from which they suggest a new explanation of the world and, most important, they all propose a transformation of the society. The goal of my thesis is to offer a new analysis of this period that spreads from 1750 to 1848. In my hypothesis, I stipulate that before 1789, the philosophers of the Enlightenment never undertook a real "de-Christianisation" and that at the turn of the century, the writers did not return exactly to Christianity. Far from taking the position that the argumentation had transformed itself in a manner that radically differed during this historical period that preceded and followed the French Revolution, my goal is to show that a same will to ameliorate the human condition on earth was manifested in comparable ways throughout these different discourses. The thought of these authors is rather a testimony of a new "sacralisation" of which finality is now on a temporal level: sin is not necessary and, more importantly, it is possible to abolish it through social reformations. This desire of a better world is the most important message that Christianity passed on to the thinkers of this period. By viewing human existence in this way, modernity could be defined not as the end, but rather as the inheritance of Christianity or, to say it all, as its humanization.