Casualty of faith healing - Madeline Neumann

No one would actually be depriving the parents in this case of their religious liberty by removing the child and treating it.
There is actually no issue because there is no intrusion onto those parents to follow their religion for themselves, to practice, and to refuse mainstream medical care for themselves if they find themselves in that situation.
The only thing being asserted is that they cannot make that judgement call for a child, regardless of whether it is their biological one or no relative of theirs.
The intrusion on their liberty is actually non-existent.