Why is circumcision okay?

I read in a previous post about the "Ashley Treatment" that deliberate mutilation is forbidden by the Church. Why then is circumcision allowed for non-therapeutic reasons? Is that not also deliberate mutilation?

Circumcision was established by God and practiced by God’s people in obedience to him for thousands of years until it was superceded by baptism. Given that, we must assume that God would not establish a ritual for his people that can be considered deliberate mutilation and thus intrinsically immoral.

Even so, parents who object to non-therapeutic circumcision have the right to refuse to circumcise their sons as a matter of conscience. They should, however, take care not to make their arguments against circumcision in such ways that it casts aspersion on the legitimate choice of other parents to circumcise.

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