We  examine the Christological foundations of the Nicene Creed, specifically focusing on the declaration of Jesus Christ as the "only-begotten Son of God." The text presents this confession not as a human invention, but as a protective wall that preserves the biblical gospel against ancient and modern distortions. By exploring titles such as "Lord" and "Christ," the author emphasizes Jesus’s divine nature, eternal existence, and unique relationship with the Father. The study distinguishes Christ’s eternal sonship from the status of Adam or adopted believers, arguing that his deity is indispensable for human salvation. Ultimately, the material serves as a theological guide to ensure that the Church maintains a scriptural understanding of Jesus as both fully man and fully God.