This is Nietzsche's most vigorous work; it conains in little over one hundred pages, a summary of his later philosophy, and as such, should probably be read after all of his other works if one means to avoid misunderstanding what Nietzsche is saying. He portrays Christianity in gory detail as the religion of revenge, dishonesty, small-mindedness and pity which it is, and a leading cause of the west's descent into nihilism. (A reading of this book almost forms a mini spiritual biography of western civilisation of the last three centuries). The adherence to a religion like Christianity forms a sort of enslavement to an outdated meaning system thus causing anyone with a scrap of intellectual integrity to lie to theirselves as a means of supporting a bankrupt world-view and while appropriate for Zarathustra's "last men", is death for all higher types, and had waged a bitter war against all manner of vitality, stregnth and honour which are the hallmarks of die ubermensche. He talks of the psychology of the priest and the natural hatred of science that they all possess as well as the slave morality and cowardice that Christianity promotes, but for all the vim that the book possesses, it is not a very scholarly work, and contains many errors. Nietzsche understandably finds it difficult to restrain himself, but this gives the work a sort of amateurish tone. Mencken has done a wonderful job here -- all the more because he had a deep appreciation for Nietzsche -- the man and his work. For those who cannot understand Nietzsche's "hatred" of Christianity, I would recommend a very thorough reading of the Geneology of Morals, which goes into much greater detail and is much more scholarly and will provide better insight into the anti-Chrsitian perspective. One of the jewels of modern literature.