It would be a peculiar interpretation of the Fourteenth Amendment indeed to hold that someone “born ... in the United States,” and thereby a citizen from birth, is not “a natural born Citizen” because one parent held citizenship in a foreign state. (By definition, ever drafter of the Constitution had two parents who held citizenship in foreign states.)
If you or the author of “Natural Born Citizen” do not like Article II, Section 1 and/or the Fourteenth Amendment of the Constitution, then I respectfully suggest that you see about amending them, rather than pretending that the plain English they contain means something other than what it clearly does.
Next you’ll be saying that Obama is a Natural Born Citizen since he was delivered not by C section.