Who then protects our inalienable rights, if you say those are not enshrined in the constitution and bill of rights?
You’re looking at it backwards.
The presumption of the Constitution is no one can rightfully take away your God-given rights and liberties per the Declaration of Independence which is the foundation of the Constitution. Individuals are born with inherent, God-given power that is “unalienable”.
So before the Constitution there IS NO federal government. The federal government’s very existence is created by the Constitution but it has no inherent power.
The power of the federal government is ONLY that which is delegated to it by the Constitution by ratification of the states and the people who relinquish a limited amount of their inherent power so they can be protected from foreign invasion by a central government. Protection from foreign invasion was the main reason for creating the federal government. If it’s not a specific, enumerated power delegated by the Constitution it is not a valid power of the federal government. As I said, most of the delegated powers are enumerated in Art. I, Sec. 8.
And that is why 80%+ of the federal government is absolutely unconstitutional and MUST be dismantled before it dismantles us.