You've got it all wrong. It didn't "just happen", certainly not by cultural adaptation, as you imply, nor did the Jewish people coin their own by-word, "Chosen." The Israelites were chosen by God, led by Him out of slavery and instructed by Him to found a holy nation and to live exemplary lives. While as a people they may have failed and incurred God's wrath on many occasions, they always return as guardians of Israel and priests of the Temple. The third Temple will be rebuilt so that Jesus can return to it on the site where He preached in His first incarnation.
Yeah well we were, earthlings in general that is, shown some very advanced organic technology and taught very important relationships between the ethereal and physical realms. You would not show or teach that to a pack of donkeys expecting much.