You realize that you're attempting to explain that to a man who doesn't understand that there was no such thing as a "first human being" either?You follow the evolution of English back far enough it is not distinguishable from the German of the same period.
English is just a name we give to a collection of words that are used today. It is not, and never has been a fixed thing. It has no origin. It has originS,... many originS.
Apparently, Charles thinks that everyone on the island of Great Britain spoke some non-English language, and suddenly, as if by magic, everyone simultaneously started speaking "English".