The true believer dies hard.
From Scialabba's review in The New Republic here:
As Carl Becker argued 85 years ago in The Heavenly City of the Eighteenth-Century Philosophers (still “the best book on the Enlightenment,” in Gray’s opinion), the philosophes “demolished the Heavenly City of St. Augustine only to rebuild it with more up-to-date materials.” Gray’s verdict is even harsher: “Racism and anti-Semitism are not incidental defects in Enlightenment thinking. They flow from some of the Enlightenment’s central beliefs.” ... [A]gain and again, Gray finds, ... a mode of thought overthrows religion, only to imitate some of its characteristic intellectual moves. ... In fact, some of the resemblances Gray claims to see between Christianity and various types of atheism are less than compelling. In a devastating critique of Becker’s Heavenly City, Peter Gay coined the phrase “the fallacy of spurious persistence” to name a tendency to claim false or exaggerated continuities. ... Of course we should keep Gray’s cautions well in mind. The catastrophic revolutionary ideologies of the past were ersatz religions. Scientific utopias and promises to transform the human condition deserve the deepest suspicion. Moral and political progress are always subject to reversal. Humans are animals; human nature is riven with conflicts; reason is a frail reed.