If the person acquires citizenship at birth by virtue of some law that Congress has passed, that person has been naturalized at birth. Examples would be a person born outside the US to a US citizen, or a person born inside the US to non-citizen parents. These people are not natural born citizens, because by either geography or parentage, they do not have sole allegiance by birth to the USA. The constitution does provide congress with the authority to make law regarding naturalization.
If a person is a natural born citizen, (i.e. born in the country, and born to parents who are both citizens), then no law affects that person's citizenship either way. That person is a natural born citizen because they cannot be anything else.
“If the person acquires citizenship at birth by virtue of some law that Congress has passed, that person has been naturalized at birth.”
Absolute horse manure.
There is no such thing as being naturalized at birth.
That is a fantasy. It does not exist. No one has ever been naturalized at birth in the entire history of the planet and no one ever will be naturalized at birth.
It is complete malarkey.
Your unsupported wild-assed assumption is that Congress does not have the power to define citizenship.
That core assumption is just a fantasy made-up out of nothing.
There is no factual or legal support for such nonsense.
“If a person is a natural born citizen, (i.e. born in the country, and born to parents who are both citizens), then no law affects that person’s citizenship either way”
Again, a total fantasy. You might like the idea, but your concept has no connection with reality.