A Fight for God 1870–1939 (Volume 9 of the History of the Church of Christ series) by Henri Daniel-Rops documents the Catholic Church's struggle against secularism, modernism, and the rise of totalitarian ideologies in Europe. It examines the crisis of faith and the church's efforts to maintain its relevance amidst the drastic socio-political upheavals between the two world wars. It also discusses the role of the Pope and Church leaders in responding to modern challenges, including theological modernism. Depicting the church as an institution fighting (militantly) for survival and defending the teachings of the faith in a world increasingly turning away from religion, this book provides a comprehensive view of the Catholic Church's place in the turbulent modern history.