Manitou explains the crucial difference between the circumcision of Isaac (8th day) and Ishmael (13+ years). The 8th day circumcision manufactures Hebrew identity and gives the Hebrew jump. A Jew is Jewish by birth regardless, but the 8th day is essential. Postponing even one day is very serious. The Zohar teaches that the angel of Ishmael claimed merit from circumcision, but God answered that without the 8th day rule, it lacks the full connection.