How do we know salvation requires spiritual circumcision?

In Colossians 2:11-12, we learn that believers undergo a circumcision not made with hands, which signifies their spiritual transformation through faith in Jesus Christ. This spiritual circumcision represents the removal of the body of sin and the initiation into the covenant community of God's people. Just as physical circumcision was required for Old Testament believers to partake in the Passover, in the New Testament, faith in Christ serves as the necessary means for entrance into God's family, reflecting the grace of inclusion based on divine initiative.