Anatole Leroy-Beaulieu was a French historian and essayist. As a practicing Christian, he was in favor of the separation of Church and State. He was the last president of the National League Against Atheism, an association founded in 1886 initially to combat anti-clericalism and socialism. Politically a liberal, in addition to being a French patriot, Leroy-Beaulieu was opposed to all forms of anti-religious sentiment. Thus this book, which could have easily been entitled ""What is Anti-Protestantism?""