Pyramid as a modern mistake?

Pyramide relates to a sacred tomb now..
Anyway..for the first time pyramid mean a structure huge building in a bread shape wich a greek bread.
Greek as a super power culture after old egypt fall fail to "understabd well" in knowing of old Egypt culture..
The Greek even could not "read" the Egyptian alphabet wich hard to understand..
Until the Rossete stelle found..greek and modern arkeologist "guessed" the old Egypt Alphabet..