If someone is born a citizen, and therefore does not need to be naturalized, then they are a natural born citizen.
The Supreme Court disagrees with you.
Naturalized at birth is such a commonly accepted practice that I find it strange that you aren’t aware of it. To be clear- natural born citizen means that citizenship is obtained without the need of statute or decree. Cruz needed a statute just to be a citizen. He is in no way possible a natural born citizen. To even think that is ridiculous on its face.