Mona Ozouf

Born in Brittany, she was a philosophy professor with different view on the French Revolution.  She published a book in 1976, which was translated in 1988 called "Festivals and the French Revolution".  the way I read was that she called the French Revolution a festival driven by fear, like most of the festivals during the time. the The Revoltion was an attempt at Utopia, as well as an attempt to bring the State together. I found it interesting that she called them sacred, because of the decline belief in Christianity.

My question... with the way of life being the way it was in France in 1789, along with enlightenment showing people you could believe in God the way it worked for you, why did she place such importance on the need for the festivals to be sacred?