The Latin Patriarch of Jerusalem Fouad Twal leads a Christmas Midnight Mass at the Church of the Nativity in the West Bank town of Bethlehem early Friday, Dec. 25, 2015 (AP)

In this Thursday, Dec. 24, 2015 photo, Iraqi Christians women take communion from Assiryan-Catholic Archbishop of Mosul, Youhanna  Boutros  Moshe, during Christmas Eve mass in the Al-Bashara Church in a refugee camp in Irbil, northern Iraq (AP)

In this Thursday, Dec. 24, 2015 photo, Iraqi Christians during Christmas Eve mass in the Al-Bashara Church in a Christian refugee camp in Irbil, northern Iraq (AP)

In this Thursday, Dec. 24, 2015 photo, an Iraqi Christian woman prays during Christmas Eve mass in the Al-Bashara Church in Christian refugee camp in Irbil, northern Iraq (AP)

Palestinian President Mahmoud Abbas, left, attends a Christmas Midnight Mass at the Church of the Nativity in the West Bank town of Bethlehem, early Friday, Dec. 25, 2015 (AP)

The Latin Patriarch of Jerusalem Fouad Twal leads a Christmas Midnight Mass at the Church of the Nativity in the West Bank town of Bethlehem early Friday, Dec. 25, 2015 (AP)

Pakistani Christians attend Christmas Day prayers at the Sacred Heart Cathedral Church in Lahore on December 25, 2015 (AFP)

People from Pakistani Christian community attend the Christmas mass at a local church, Friday, Dec. 25, 2015 in Islamabad, Pakistan (AP)

The Roman Catholic Archbishop of Khartoum, Gabriel Zubeir Wako (R), attends a Christmas eve mass at the St. Matthew Catholic church in the Sudanese capital Khartoum in the early hours of December 25, 2015 (AFP)

Christian worshippers congregate outside the All Saints Cathedral after attending a mass on Christmas Day in Kenya's capital Nairobi December 25, 2015 (Reuters)

People attend a Christmas Eve mass at St. Paul's Cathedral in Kolkata, India, December 24, 2015 (Reuters)

People attend a mass service on Christmas day at a church in Banda Aceh on December 25, 2015 (AFP)

Kosovo Christians attend the Christmas Eve Mass in Mother Teresa Cathedral in Kosovo capital Pristina, past midnight on Friday, Dec. 25, 2015 (AP)

Pope Francis prays in front of a statue of baby Jesus as he leads the Christmas night Mass in Saint Peter's Basilica at the Vatican December 24, 2015 (Reuters)

Pope Francis arrives to celebrate the Christmas Eve Mass in St. Peter's Basilica at the Vatican, Thursday, Dec. 24, 2015 (AP)

Assyrian Christians from Syria and Iraq, attend a Christmas mass at Saint Georges church in an eastern suburb of the Lebanese capital Beirut, on December 25, 2015 (AFP)

Assyrian Christians from Syria and Iraq, receive communion during a Christmas mass at Saint Georges church in an eastern suburb of the Lebanese capital Beirut, on December 25, 2015 (AFP)