Matthew Henry Commentary Romans 2:25-29

"For circumcision indeed profiteth, if thou be a doer of the law: but if thou be a transgressor of the law, thy circumcision is become uncircumcision. If therefore the uncircumcision keep the ordinances of the law, shall not his uncircumcision be reckoned for circumcision? and shall not the uncircumcision which is by nature, if it fulfil the law, judge thee, who with the letter and circumcision art a transgressor of the law? For he is not a Jew who is one outwardly; neither is that circumcision which is outward in the flesh: but he is a Jew who is one inwardly; and circumcision is that of the heart, in the spirit not in the letter; whose praise is not of men, but of God." — Romans 2:25-29 (ASV)

No forms, ordinances, or notions can profit without regenerating grace, which will always lead to seeking to partake of the righteousness of God by faith.

For he is no more a Christian now than he was truly a Jew of old who is so only outwardly; neither is that true baptism which is merely outward in the flesh; but he is the real Christian who is inwardly a true believer, with an obedient faith.

True baptism is that of the heart, through the washing of regeneration and the renewal of the Holy Ghost, bringing about a spiritual frame of mind and a willing adherence to truth in its holy ways.

Let us pray that we may be made real Christians: not outwardly, but inwardly; in the heart and spirit, not in the letter; baptized not with water only, but with the Holy Ghost. And let our praise be not from men, but from God.