"The first question is whether religion is not a human invention to make men better because of the fear of the punishments that the gods might inflict on them. Many philosophers were of this opinion. Indeed, being true that all the Human actions are moved out of fear of evil (pain) and hope of good (pleasure), to prevent men from transgressing the laws that prohibit them from doing certain things, various punishments have been established in the world, including that of dishonor, to which the naturally vain man is very sensitive. Nevertheless, the malice of men can invent things to circumvent the vigilance of the magistrates or resort to force to place themselves above the laws, and consequently remove them the power to judicially condemn them. That is why fear of the gods or of a remunerating god of good or evil deeds was invented."

The manuscript, so far never edited, consists of 114 pages divided into eight chapters or doubts, the eighth being by far the most extensive of them. His only known copy is in the Royal Library of Belgium (ms.15191) and is fully titled Doubts of the Pyroronics. Firstly, about whether religion was conceived or comes from God, or if it is an artifice of the politicians, Secondly, assuming that God is the author of it, about which is the true and which is precise choose from the large number of different religions that have spread throughout the land. The copy is after 1721; however, according to Gianni Paganini's conjecture based on the writings he quotes and, above all, those he does not quote (Montesquieu's Persian Letters, for example), the text would have originally been written a little earlier, in the second decade from the 18th century. As for its author, everything indicates that it was a single pen, but there are no other indications.