How do we know spiritual circumcision is essential for salvation?

Spiritual circumcision is vital for salvation as it reflects a heart that is softened and transformed by God's grace. In Colossians 2:11, Paul refers to 'the circumcision made without hands' in relation to the cutting away of sin through the work of Christ. This spiritual transformation is necessary for acceptance before God, as those who are spiritually circumcised are considered part of His covenant people. The New Testament emphasizes that salvation does not depend on outward rituals but on faith in Christ facilitated by the Holy Spirit’s work in the heart.