At the moment, almost a third of the world's population at least nominally belongs to one or another Christian denomination. All these people are united by a more or less deep faith in God the Creator and God’s Son Jesus Christ, the rite of baptism they have undergone and the intention to follow certain moral requirements, which again can be embodied in their lives relatively fully. In a book of such a small volume it is very difficult to even talk about major milestones in the history of Christianity, but the authors hope that the book will become a guide to other books, more detailed and meaningful.