Such hopeful features have helped promote fresh interest among young Polish Jews and quite a few Gentiles in Poland's Jewish history since the communist era, when many Poles of Jewish background thought it wise to blur their ancestry.
But for the National Religious Party slightly less Orthodox but much more Zionist Mr Lubotzky's solution is anathema, for it would mean that Israel, the divinely destined Jewish state, was formally recognising as Jews people who, under Orthodox law, were still gentiles.