Oh? Really! Then how come I was never singled out for conversion as a child?
I'm not talking specifically of the "larger national culture." Culture pertains to any set of sociological norms, like family life, marriage, etc. If a family is religious, they can't just divorce that part of their family culture from their child-rearing. It would be dishonest, because (even if it were possible; it's not, faith is spread throughout one's life experience, and often impacts us in ways we don't notice) the parents wouldn't be presenting their true selves to their children. That's ultimately damaging.
Just specific ideas that you happen to disagree with.
You said "agnostic households." So the household has a culture of "we don't know/don't care." That's the framework within which the child grows up and compares to her/his selfhood. And guess what! The child will very likely grow up to embrace that same agnosticism! But, of course, that would "limit" the child's potential to just assume agnosticism, as you say. (I suppose, though, that that limitation doesn't "count" because, at least the child isn't embracing some duffs religion.) Do you see? One can't just not have a cultural influence within a family. If a family believes, the child will likely believe. If a family doubts, the child will likely doubt.
For starters, the Hippocratic oath -- first do no harm. Then there's the whole not experimenting with human life thing,the whole human euthanasia thing, abortion issues, etc. On the science side, how about nuclear non-proliferation? Or toxic waste?