The book offered to the reader is a collection of articles in which the author, teacher at the Moscow Theological Seminary Yu. Maksimov, examines the modern realities of Christianity and Islam from the point of view of Orthodox theology. This is the first book of its kind published in our country after the October Revolution of 1917. Comparing the sacred texts of Christianity and Islam - the Bible and the Koran, statements of ancient authoritative thinkers on both sides, arguments of modern apologists, confessions of people who converted from one religion to another , drawing on a total of about two hundred sources, the author builds a study that is unique in its depth of penetration into the stated topic and accompanying material. The collection offered to the reader is a good example of covering many problematic issues of Christian-Muslim relations from the point of view of Orthodox theology. Anyone who reads this book will be able to learn something new, previously unknown, which will enrich his understanding of both Christianity and Islam.