Why is spiritual circumcision necessary for believers?

Spiritual circumcision is essential for all believers as it signifies a transformative act of the Holy Spirit where the heart is cleansed from sin. In Philippians 3:3, Paul explains that true worshipers are those who have experienced this heart circumcision and thus worship God in spirit and understanding, recognizing their complete dependence on Christ. This inward transformation prepares believers to serve God faithfully and partake in the covenant blessings. Without spiritual circumcision, one cannot fully engage in the life of faith, as it represents both a commitment to Christ and an acknowledgment of His sovereignty over one's life.