Circumcision has value if you observe the law, but if you break the law, you have become as though you had not been circumcised. (NIV)
Circumcision does indeed profit if you keep the Law; but if you habitually transgress the Law, your circumcision is made uncircumcision. (AMP)
For circumcision verily profiteth, if thou keep the law: but if thou be a breaker of the law, thy circumcision is made uncircumcision. (KJV)