Kultus Akal Budi adalah agama ateistik yang disponsori negara yang pertama kali didirikan di Prancis, yang ditujukan sebagai pengganti Katolik Roma pada masa Revolusi Prancis. Kultus tersebut juga bersaing dengan Kultus Sosok Tertinggi buatan Robespierre.[1][2][3][4]
Holbach carried the cult of reason and nature to its culmination in an atheistic denial of the deists' Supreme Being, and made the most influential attack on rational religion ...
During the French Revolution in 1793 the Gothic Cathedral of Notre Dame de Paris was rededicated to the Cult of Reason, an atheistic doctrine intended to replace Christianity.
In May, he proposed an entire cycle of revolutionary festivals, to begin with the Festival of the Supreme Being. This latter was intended to celebrate a new civil religion as opposed to Christianity as it was to the atheism of the extreme dechristianizers (whose earlier Cult of Reason Robespierre and his associates had repudiated).
He was an active member of the faction that successfully campaigned for the atheistic 'Cult of Reason', which was officially proclaimed on November 10, 1793.