You invoke Congress' power of "naturalization" to assert that someone is a "natural born citizen."
Congress cannot MAKE "natural citizens", they can only naturalize.
You are incorrect. Congress was not granted only the power to naturalize non-citizens. Congress was granted the specific power of determining the “rules of naturalization” (see Article 1 section 8). That includes not only those that require naturalization, but also those who DO NOT require naturalization.
In fact, in the very first congress, they passed the first naturalization act where they specifically state who would be a “natural born citizen”. This law was established by our founding fathers and was signed by none other that George Washington. So your assertion that Congress cannot make “natural citizens” (which of course there is no such thing) is correct but that is a false straw-man argument.
There are only two types of citizens - naturalized and natural born. The RULES OF NATURALIZATION determine who must be naturalized (not a citizen at birth) and who is a naturally born citizen (not requiring naturalization). The power to make those rules is specifically granted in Article 1 section 8 of the Constitution to Congress.