Don Juan was described by a contemporary as "a school of Atheism." Tartuffe so stirred up the clergy that some clerics wanted the playwright burned as a heretic! Instead, he was excommunicated.
Montaigne was a Deist, but refrained from candor about his beliefs due to the mutual slaughter between Catholics and French Huguenots of the time. "It is setting a high value upon our opinions," he wrote, "to roast men and women alive on account of them."