How can Muslims be both good citizens of liberal democracies and good Muslims? This is among the most pressing questions of our time, particularly in contemporary Europe. Some argue that Muslims have no tradition of separation of church and state and therefore can't participate in secular, pluralist society. At the other extreme, some Muslims argue that it is the duty of all believers to resist Western forms of government and to impose Islamic law. Andrew F. March is seeking to find a middle way between these poles. Is there, he asks, a tradition that is both consistent with orthodox Sunni...