But in the mid-18th century, during the French Enlightenment, a more ideological use of the term had come into use. In 1765, the author of an anonymous article in a French Enlightenment periodical spoke of "The general love of humanity ... a virtue hitherto quite nameless among us, and which we will venture to call 'humanism', for the time has come to create a word for such a beautiful and necessary thing". The latter part of the 18th and the early 19th centuries saw the creation of numerous grass-roots "philanthropic" and benevolent societies dedicated to human betterment and the spreading of knowledge (some Christian, some not). After the French Revolution, the idea that human virtue could be created by human reason alone independently from traditional religious institutions, attributed by opponents of the Revolution to Enlightenment philosophes such as Rousseau, was violently attacked by influential religious and political conservatives, such as Edmund Burke and Joseph de Maistre, as a deification or idolatry of humanity. Humanism began to acquire a negative sense. The Oxford English Dictionary records the use of the word "humanism" by an English clergyman in 1812 to indicate those who believe in the "mere humanity" (as opposed to the divine nature) of Christ, i.e., Unitarians and Deists. In this polarised atmosphere, in which established ecclesiastical bodies tended to circle the wagons and reflexively oppose political and social reforms like extending the franchise, universal schooling, and the like, liberal reformers and radicals embraced the idea of Humanism as an alternative religion of humanity. The anarchist Proudhon (best known for declaring that "property is theft") used the word "humanism" to describe a "culte, déification de l’humanité" ("worship, deification of humanity") and Ernest Renan in L’avenir de la science: pensées de 1848 ("The Future of Knowledge: Thoughts on 1848") (1848–49), states: "It is my deep conviction that pure humanism will be the religion of the future, that is, the cult of all that pertains to humanity—all of life, sanctified and raised to the level of a moral value."

During which period was the philosophy of humanism next updated?