The debate here seems to boil down to(from my Orthodox Jewish perspective at least):

1. There is a subjective morality that says a parent must not make decisions for a child that will affect it in a manner that could possibly be perceived as negative

2. There is a subjective morality that says to follow your religion, and one aspect of the religion is circumcising your son at 8 days old

The people ascribing to the first believe it to be an objective morality. The people ascribing to the second believe it to be an objective morality.

¯\_(ツ)_/¯