Lets NOT set aside the REAL issue of religious freedom
Lets discuss the freedom of religious choice.
If you circumcise someone at a young age you remove someones ability to make a choice, when they are mature enough to do so.
You dont seem to be fully able to grasp this...you seem to think that children are the property of their parents...no...they are their guardians.
I grasp your point just fine. I disagree with it. I believe it is not only the prerogative, but the responsibility of parents to pass on the values, practices, ideals, philosophy, and attendant ritual, literary, and spiritual legacies of their culture/religion to their children. That is part of good guardianship.
Culture is not passed on in a vacuum. French people raise their kids to be French, to speak French, to embrace French literature, love French food, and other French stuff. Yoruba raise their kids to be Yoruba, to speak the Yoruba languages, and to embrace their various tribal forms of scarification. Maori, who were almost culturally annihilated by colonialism, are again beginning to raise their kids to speak Maori, to learn the tales and crafts of their ancestors, and to be tattooed in the old styles. We all have stuff we pass on. When grown, people get to make choices about how much they will accept or reject their culture, but culture will be lost of parents make no attempt to pass it on.
It is the responsibility of Jewish parents to raise Jews. Part of that responsibility is to ensure our boys are circumcised properly at eight days of age. Not doing so is a failure to be a good Jewish parent, and is both depriving the child of complete affiliation with his culture, but making it much more painful and demanding for him to affiliate later by choice.
The idea that one should withhold the fullness of cultural integration on the assumption that those sorts of choices should be made as an adult is a fallacy. Because once withheld, by the time the child is an adult, he will not have acculturated, and will be hard put to understand the value of the choice he is offered. That kind of idea is usually just camouflage for a universalist cultural assimilation agenda-- which I am not accusing you of fostering, but am merely pointing out that this is how that idea is generally employed. And for good reason, as, almost inevitably, failure of parents to acculturate their children leads to assimilation and loss of cultural identity.
If you don't value your culture, that's your right. And nobody should force you to do so. But nobody has the right to simply condemn cultures to death because they feel uncomfortable with elements of that culture. Again, if you don't approve, don't join that culture, or if you're already part of it, leave it.