I don't want to extend this discussion unduly, but nobody has
mentioned as yet that nothing is known of Jesus' life between the
ages of 12 (precocious encounter with scribes) and 30 (start of
ministry). He almost certainly travelled about the known world
("And did those feet in ancient time walk upon England's mountains
green?") and could have obtained schooling in anything there was to
learn. (Visits to Tibet?). He had supernatural powers anyway, so
Greek would've been pi to him.