The article makes it clear that the Israeli rabbinate considers "Jewishness" something that has nothing to do with practice, but with blood and descent. So it's

The article makes it clear that the Israeli rabbinate considers "Jewishness" something that has nothing to do with practice, but with blood and descent. So it's definitely not religious. You're right that there are multiple ethnicities under the Jewish label, but 90-95% of the US Jewish population is in fact Ashkenazi, making it a relatively homogeneous ethnic group. https://en.m.wikipedia.org/wiki/American_Jews https://en.m.wikipedia.org/wiki/American_Jews