Theatergoers arrive for 'Leopoldstadt,' a play about several generations of a Jewish family in Vienna, at Wyndham's Theatre in London in 2020. Isabel Infantes/AFP via Getty Images“Emma,” a young Jewish woman who we met in 2019, didn’t belong to a synagogue. She didn’t have a Jewish partner. She didn’t observe Jewish rituals regularly. On most surveys about religion, she would not seem very engaged with Judaism. But as Emma talked about what she …