In the old Soviet Union your internal passport was stamped with your "nationality."

Significant numbers of Soviet citizens whose internal passports identified them as Jewish immigrated to Israel.

Some of those immigrants, however, are neither culturally or religiously Jewish. Many, in fact, are orthodox Christians. A major pilgrimage site for these Russian Orthodox Christians is St. Catherine's Monastery in the Sinai.

In both my trips to Sinai, I encountered large bus tourgroups of Orthodox Christian pilgrims visiting the sites, all speaking Russian, not modern Hebrew.