The church is one of Christianity's most visited and sacred shrines. Standing above the grotto where, according to tradition, Jesus was born, the church attracted more than 2 million visitors last year. But the building, with remnants up to 1,500 years old, has been neglected for decades.
Both the World Monuments Fund, a U.S.-based nonprofit group dedicated to protecting historic sites, and the U.N. cultural agency UNESCO have placed the church on their lists of endangered sites. And a high-tech survey by a consortium of Italian experts in 2011 called for urgent repairs.
The city of Bethlehem is situated in a part of the West Bank where the Palestinians have self-rule. The Western-backed Palestinian Authority has taken the lead and is financing a great portion of the works, said Ziad al-Bandak, an adviser on Christian affairs to Palestinian President Mahmoud Abbas.
He said the government has provided $1 million, while an additional $800,000 is coming from the private sector. The rest is coming from European countries such as France, Hungary, Russia and Greece, contributing to the roughly $3 million in total needed for the first phase, al-Bandak said.
Beyond the painstaking process of preserving a delicate holy site, the work has been complicated by the sensitive relations among the three Christian denominations that share ownership of the church.
The Roman Catholic, Greek Orthodox and Armenian churches have traditionally viewed each other with deep suspicion. They run the Nativity Church according to a 19th century codex, known as the Status Quo, which assigns responsibilities for upkeep that are jealously guarded by each denomination. Relations are so fraught that these turf battles have occasionally escalated into fistfights between clergymen.
A senior church official said the three denominations would never have been able to reach an agreement on their own. But once the Palestinian Authority stepped in, all three churches accepted the decision. He spoke on condition of anonymity because he was not permitted to discuss the matter with the media.
The first phase, expected to last one year, is being carried out by "Piacenti," an Italian firm that specializes in the renovation of historical sites. One by one, experts will repair the hundreds of wooden beams in the roof.
Company president Giammarco Piacenti said the rooftop was masterfully restored by Venetian carpenters in 1478. He said the project would be conservative and seek to keep as many original pieces as possible.
"We'll save as many parts, even those in bad conditions, as we can," he said. "We'll only replace pieces that are no longer functional and can no longer help hold the roof. They will be as few as possible and will be made of a compatible wood, of aged wood of the same type and quality."
Aside from the roof and windows, other elements that will need repair in the future are the external facade, internal plastering, wall mosaics and paintings and wooden works, said Tweme. If funding is secured, the work could take four to five years, he said.
The church was built in the 4th century by Saint Helena over a cave where the Virgin Mary is said to have given birth. What pilgrims mostly see today is the basilica church built by the Byzantine Emperor, Justinian I, who ruled from 527 to 565 AD.
The construction doesn't include the area that is the main focus of the pilgrimage: the place located under the altar crypt that hosts the 14-pointed silver star marking the spot where, according to Christian tradition, Jesus was born.
In spite of large scaffolding lining the sides of the nave near the entrance, visitors don't seem to mind, at least for the moment. Sister Aziza, an Eritrean nun who lives in Israel, welcomed what she says is much-needed repair.
"I'm very grateful and happy that they're renovating it. Otherwise it will fall," she said. "And it will be safer for people and also to worship. It is a nice step that they agreed to renovate it, because for so many years I've been waiting for this renovation."