The book "Theoretical Foundations and Methodology of the Polemic with Protestantism" is a study that deeply immerses the reader in the complex topic of the relationship between Orthodoxy and Protestantism. The author examines in detail the history of polemical disputes, the main aspects of this discourse until now, and also singles out the key principles and methods used in polemics by representatives of both faiths. The book draws attention to the current issues of interaction between different Christian currents, examines the advantages and disadvantages of polemics as a tool for dialogue, and also provides the reader with an opportunity to better understand the theological and philosophical bases of both sides. Based on deep knowledge and analytical thinking, the author offers new approaches to solving problems that arise in polemical interactions. This book will be a useful resource for anyone interested in religious debates, theology, and philosophy of Christianity.