Paul is repeating verse two , that every person that is circumcised for a religious purpose, he is required to keep every last word of the law, and he/she will be judged by them all. When you put yourself under the law, then even the laws that are unknown to you, you will be judged on them by God. Only Christ was perfect and able to keep it all."Repentance of your sins in Jesus name " gives us the credentials to go before the throne of God, and have a sin blotted out of the book of life. You are either under the grace given under the blood of Christ, or you are under the law, and it is you that does the choosing. When you teach that there is no forgiveness, under a specific one of those laws, you have condemned your self under the whole law, for Christ's blood is sufficient to cover any sin that is repented to; the Father in Jesus name. Love is the most powerful thing in the world. "Circumcision" that is done under religious beliefs, has nothing to do with salvation. It is done to fulfill part of the law, so when it is done for religious beliefs, it takes you out of your "hope of righteousness by faith in Jesus Christ". This is why in the time of Grace that we are now under, all circumcision is of the heart, and that is why it is for both men and women, for it becomes a spiritual matter, and not a physical act. Both male and female have an active part in serving the living God. There is more to Paul writings, and no one can say in all honestly that Paul taught people not to observe it, he taught the law in the completeness of Christ, once you understand all of the letters.Remember, most of the people he addresses in the scripture you quoted, where being taught by the Pharisees that they had to observe the old covenant blood letting practices. And this is against what is written.