How the Jews tricked God.
They got God to make a covenant with Abraham for a piece of foreskin.
The covenant is a promise that God made with Abraham. According to the covenant, God would offer protection and land to Abraham and his descendants, but they must follow the path of God. God then commanded Abraham and his future generations to perform the ritual of circumcision (brit milah) as a symbol of the covenant.
When God realized his mistake he gave the Jews 613 commandments to atone for their trickery.
When that failed God sent his only begotten son Jesus to save them.
Matthew 15: 24 “I was sent only to the lost sheep of Israel.” Remember, God chose the Israelite's as his own and He was their God. If you were drawn to God, you didn't remain a Gentile and worship God, you were circumcised as a male and became Jewish.
Christians did a better job by getting God to protect them without the old covenant of circumcision.