Indonesia, the country with the world’s largest Muslim population, is engaged in a debate about religious tolerance that might seem familiar to Americans. Last week, one day after Americans opposed to the construction of an Islamic center in Lower Manhattan pledged to “Stop the Islamization of America,” a group of Islamists rallied in Bekasi, outside the Indonesian capital, to fight the “Christianization” of Indonesia, by blocking the planned construction of a church. Two leaders of the small congregation of Indonesia Christians in Bekasi were seriously wounded when the rally against their planned church by vigilantes from the Islamic Defenders’ Front,...