If you are opposed teaching a common body of shared knowledge to all children, you are opposed to teaching children to read. You are in favor of illiteracy, either by choice or indifference. You favor damaging our most vulnerable children by denying them the most critical thing: the functional knowledge they need to succeed.
They also point out that critical thinking is not a skill that can be learned outside of content knowledge. For example, someone who has domain specific knowledge of chemistry will not be able to apply critical thinking skills to history without the domain specific knowledge that field requires. Teaching content = Teaching reading!