Yeah but most of those subgroups of Jewish people can usually trace their lineage back at least somewhat reliably to the Jewish diaspora.

Also most sects of Judaism aren't evangelical and don't actively seek out new adherents, only practicing within the bounds of their own community even if they do occasionally accept converts (and most converts are people who marry into the faith). Christianity isn't consider ethnoreligious cuz Christianity actively went out and sought new adherents in a variety of cultures.