“And Abraham took Ishmael his son, and all that were born in his house, and all that were bought with his money, every male among the men of Abraham’s house; and circumcised the flesh of their foreskin in the selfsame day, as God had said unto him.” Gen. 17:23
One man can physically circumcise another man, but no one can circumcise another person’s heart. That circumcision of the heart only happens to a willing vessel performed by the mighty hand of God.