Why? Did all those people in power in Hollywood and all those jew CEOs learn hebrew?
I doubt it.
I think jews just know you are a jew by your last name and facial appearance.
My facial appearance is 100% Norwegian looking, so that is a problem, but I could always fake the jew name by choosing something like "Friedmann"... why not?
When I present my self in venues all jews will sub-consciously think "Oh, he is one of us, must help this guy out", no?