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St. Peter was definitely Jewish. Whether St. Linus was, I don't know. The city of Volterra, Italy, claims him as a native son, but that seems unlikely (that's in an out-of-the-way part of Tuscany, so may not have had any Christians by the 60s of the first century...of course Linus could be a Volterran who had moved to Rome. A lot of the early popes have Greek-sounding names, which could mean they originated in the Greek-speaking population of Rome (which would include most of the Jews who were living in Rome, I suppose).

One of the Merovingian kings forcibly converted many of the Jews who were then living in what is now France. At other times in the Middle Ages some of the Jews of Europe converted to Christianity (either voluntarily or under compulsion) and anyone of European descent now could be descended from one of those Jews...so Benedict XVI could have Jewish ancestors, and the same could be true of John Paul II, John Paul I, Paul VI, etc.

Of course this Muslim "expert" is still an idiot.

Maybe Icelanders would be an exception if there were no Jews in Norway or the Western Isles of Scotland at the time that Iceland was first settled.