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If the sign of the covenant God made with Abraham of which we are partakers, is one of circumcision, how does that translate into the New Testament covenant that we have with God through Christ Jesus?

In my walk with the Lord, I have come to realize that just as the organs in our physical body are vital for the sustenance of the life of a human being, so also are there vital organs of our faith that must be properly maintained and exercised for our well-being as children of God.