Well, Robespierre himself didn't like the de-christianization. As for the Cult of the supreme being: Robespierre was a deist, in other words he believed in the existence of a greater being/god, but he wasn't an adherent of any existing religion. He didn't like atheism, calling it aristocratic. The Cult of the Supreme Being was essential him trying to connect the ideals of the revolution with the believe in a deity.


(I find it funny that there seem to be a lot of people who think Robespierre was an atheist. I've seen him (or rather, the "bloodthirsty monster" version of him) being named as an example why atheism supposedly leads to mass murder.)