Charles-François Dupuis

https://en.wikipedia.org/wiki/Charles-Fran%c3%a7ois_Dupuis

Charles François Dupuis (26 October 1742 – 29 September 1809) was a French savant, a professor (from 1766) of rhetoric at the Collège de Lisieux, Paris, who studied for the law in his spare time and was received as avocat in 1770. He also ventured into the field of mathematics and served on the committee that developed the French Republican Calendar.

Along with Constantin François Chassebœuf de Volney (1757–1820) Dupuis was known for developing the Christ myth theory, which argued that Christianity was an amalgamation of various ancient mythologies and that Jesus was a mythical character.