DAMASCUS, Syria (AP) – Syria’s interim president on Thursday signed a temporary constitution that leaves the country under Islamist rule while promising to protect the rights of all Syrians for five years during a transitional phase.

The nation’s interim rulers have struggled to exert their authority across much of Syria since the Islamist former insurgent group, Hayat Tahrir al-Sham, or HTS, led a lightning insurgency that overthrew longtime President Bashar Assad in December.

Former HTS leader Ahmad al-Sharaa is now the country’s interim president—a decision that was announced after a meeting of the armed groups that took part in the offensive against Mr. Assad. At the same meeting, the groups agreed to repeal the country’s old constitution and said a new one would be drafted.

While many were happy to see an end to the Assad family’s dictatorial rule of more than 50 years in the war-torn country, religious and ethnic minorities have been skeptical of the new Islamist leaders and reluctant to allow Damascus under its new authorities to assert control of their areas.

Abdulhamid Al-Awak, one of the seven members of the committee Mr. al-Sharaa tasked to draft the temporary constitution, told a news conference Thursday that it would maintain some provisions from the previous one, including the stipulation that the head of state has to be a Muslim, and Islamic law is the main source of jurisprudence.

But Mr. Al-Awak, a constitutional law expert who teaches at Mardin Artuklu University in Turkey, also said that the temporary constitution includes provisions that enshrine freedom of expression and the media.

The constitution will “balance between social security and freedom” during Syria’s shaky political situation, he said, and will set up an “absolute and rigid separation” between legislative, executive and judicial authorities.

The text of the temporary constitution, published late Thursday, sets up a People’s Committee which will serve as an interim parliament until a permanent constitution is adopted and elections held. Two thirds of its members will be appointed by a committee selected by the interim president and one third by Mr. al-Sharaa himself.

The documents says the state is “committed to combatting all forms of violent extremism while respecting rights and freedoms” and that “citizens are equal before the law in rights and duties, without discrimination based on race, religion, gender or lineage.” It stipulates that the army is a “professional national institution” and arms outside of its control are prohibited and designates “glorifying the former Assad regime” as a crime.

A new committee to draft a permanent constitution will be formed, but it is unclear if it will be more inclusive of Syria’s political, religious and ethnic groups.

Mr. al-Sharaa on Monday reached a landmark pact with the U.S.-backed Kurdish-led authorities in northeastern Syria, including a ceasefire and a merging of their armed forces with the central government’s security agencies.

The deal came after government forces and allied groups crushed an insurgency launched last week by gunmen loyal to Mr. Assad. Rights groups say that hundreds of civilians—mostly from the Alawite minority sect to which Mr. Assad belongs—were killed in retaliatory attacks by factions in the counteroffensive.

A key goal of the interim constitution was to give a timeline for the country’s political transition out of its interim phase. In December, Mr. al-Sharaa said that it could take up to three years to rewrite Syria’s constitution and up to five years to organize and hold elections.

Mr. al-Sharaa appointed a committee to draft the new constitution after Syria held a national dialogue conference last month, which called for announcing a temporary constitution and holding an interim parliamentary election. Critics said that the hastily organized conference was not inclusive of Syria’s different ethnic and sectarian groups or civil society.

The United States and Europe have been hesitant to lift harsh sanctions imposed on Syria during Mr. Assad’s rule until they are convinced that the new leaders will create an inclusive political system and protect minorities. Mr. al-Sharaa and regional governments have been urging them to reconsider, fearing that the country’s crumbling economy could bring further instability.