François Guizot 
Meditations on the Actual State of Christianity, and on the Attacks Which Are Now Being Made Upon It. [PDF ebook] 

"Next to the essence of the Christian Religion, " I said in my Preface, "comes its history; and this will be the subject of a second series of Meditations, in which I shall examine the authenticity of the Scriptures; the primary causes of the foundation of Christianity; Christian faith, as it has always existed throughout its different ages and in spite of all its vicissitudes; the great religious crisis in the sixteenth century, which divided the Church and Europe between Romanism and Protestantism; finally, those antichristian crises which, at different epochs and in different countries, have set in question and imperiled Christianity itself, but which dangers it has ever surmounted. The third series of Meditations will be consecrated to the study of the actual state of the Christian religion, its internal and external condition. I shall retrace the regeneration of Christianity which occurred among us at the commencement of the nineteenth century, both in the Church of Rome and in the Protestant Churches; the impulse imparted to it at the same epoch by the Spiritualistic Philosophy that then began again to flourish, and the movement in the contrary direction which showed itself very remarkably soon afterward in the resurrection of Materialism, of Pantheism, of Skepticism, and in works of historical criticism.
I shall attempt to determine the idea, and consequently, in my opinion, the fundamental error of these different systems, the avowed and active enemies of Christianity. Finally, in the fourth series of these Meditations, I shall endeavor to discriminate and to characterize the future destiny of the Christian religion, and to indicate by what course it is called upon to conquer completely, and to sway morally, this little corner of the universe, termed by us our earth, in which unfold themselves the designs and power of God, just as, doubtless, they do in an infinity of worlds unknown to us."
Contents
The awakening of Christianity in France in the nineteenth century — Spiritualism — Rationalism — Positivism — Pantheism — Materialism — Skepticism — Impiety, recklessness, and perplexity.