But the requirement for membership of the ethnic group which is set by that group is (and please do correct me if I'm wrong here) having a Jewish mother, right? Meaning that somebody who has a partly Jewish father isn't Jewish, yes?
That's the traditional Orthodox view.
Here in America, Reform/Reconstructionist Jews and secular Jews view someone as Jewish from either parent.
so if you read the old book and it said that everyone comes from Adam and Eve and then they come from Noah after the flood are we all Jews?
Noah was not Jewish...
I'm not surprised a Catholic has poor knowledge of the Bible...