It is a well-known fact that Madame de Staël held the Protestant Reformation in high regard and preferred Protestantism to all other religions. To her, Protestantism was the most moral and the most enlightened religion available; it was the the religion most compatible with, and even conductive to, progress.
But why was this so, and what exactly did Madame de Staël mean by Protestantism? It is an important question, because answering it will shed light on the nature of her liberalism and, more particularly, on the interconnectedness of her religious and her political views.
Rosenblatt, Helena. “Madame de Staël, the Protestant Reformation and the History of ‘Private Judgement’.” Annales Benjamin Constant, 31-32 (2007): 143-154.