The sermon centers on the covenant sign of circumcision in Genesis 17, presenting it as a physical yet spiritually significant marker of God's enduring promise to Abraham and his descendants, which the New Testament fulfills through baptism. It emphasizes the continuity between the Old and New Covenants, arguing that the inclusion of children in the covenant community—evident from Genesis onward—remains consistent in the church's practice, despite modern debates over baptismal mode. The sign, while not guaranteeing salvation, points to the necessity of spiritual renewal, as underscored by Paul's teaching that true circumcision is of the heart, and that faith—not ritual—confers covenant membership. The preacher calls the congregation to affirm their baptism, pray for covenant children, and allow Scripture, not tradition or personal experience, to shape their theological convictions, all while maintaining unity in Christ despite differing views on baptism.