Abstract:Les Américaines ou La preuve de la religion chrétienne par les lumières naturelles contains much philosophy and theology. The author uses the Cartesian system of the “bête-machine” to prove the immortality of the human soul and the truth of the Christian religion. On the one hand she refers to Helvétius’ De l’esprit to reject its materialist principles, and on the other she works within the tradition of Pierre Bayle’s 1697 Dictionnaire historique et critique.