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To inaugurate the new state religion, Robespierre declared that 20 Prairial Year II (8 June 1794) would be the first day of national celebration of the Supreme Being, and future republican holidays were to be held every tenth day. The Cult of the Supreme Being (French: Culte de l'Être suprême) was a form of deism established in France by Maximilien Robespierre during the French Revolution. it was intended to become the state religion of the new French Republic and a replacement for Roman Catholicism and its rival, the Cult of Reason.