I beg to differ. In New York as a Kindergartner in 1954, my elementary school was 90% Jewish. I still have my kindergarten picture. I was blond as anything. All but two of the rest of the class have dark dark hair and dark skin, as well as distinctive features. If Judaism were simply a religion, you would not be able to tell any difference between me and the other children.
I beg to differ. In New York as a Kindergartner in 1954, my elementary school was 90% Jewish. I still have my kindergarten picture. I was blond as anything. All but two of the rest of the class have dark dark hair and dark skin, as well as distinctive features. If Judaism were simply a religion, you would not be able to tell any difference between me and the other children.