Philippians 3:4-6 ... though I myself have reason for confidence in the flesh also. If anyone else thinks he has reason for confidence in the flesh, I have more: circumcised on the eighth day, of the people of Israel, of the tribe of Benjamin, a Hebrew of Hebrews; as to the law, a Pharisee; as to zeal, a persecutor of the church; as to righteousness under the law, blameless.
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It’s possible to keep the Law, on the outside. Jesus said they were whitewashed tombs and clean on the outside and full of rottenness and corruption on the inside.
Keeping the Law "on the outside" isn't keeping the Law.