TRIPOLI—Wearing prayer tassels, a yarmulke and Star of David pendant, the man who says he is the first Libyan Jew to return to the country since Moammar Gadhafi's ouster on Sunday reopened the city's lone synagogue for the first time in 44 years.

Reopening the Dar Bishi Synagogue stands as a bold challenge to the country's new leaders to prove their commitment to the pluralistic democratic values they espouse, said David Gerbi, who fled to Rome in 1967 at the age of 12.

"You...