A century ago, it was easy to tell Catholics and Protestants apart in America. Unless they are coming out of church, it’s difficult to do so now. One major reason for this is the high rate of intermarriage between Catholics and Protestants over the last few generations. Is a similar trend taking place among Jews and gentiles today (excluding the Orthodox, who constitute a bit under 10% of the American Jewish population)? The data suggest so:
To oversimplify, half of Jews under the age of 50 are half-Jewish. That’s an oversimplification because it assumes Jewishness is ethnic rather than religious. There are of course those with one ethnically Jewish parent who consider themselves to be Jewish and others who have one ethnically Jewish parent but do not consider themselves to be Jewish at all. The latter will have been largely excluded from the survey this data is drawn from.
That technical consideration aside, this is a sea change from sixty or seventy years ago. It helps explain why there is some convergence in test scores among younger Jews and gentiles compared to older cohorts and also why younger Jews tend to be less politically left-leaning than older Jews do.