In the last two weeks however, men from the al-Qaeda linked Jabhat al-Nusra and other rebel groups have captured the nearby towns of Nawa and al-Sheikh Maskin, bringing the frontline to less than two miles away. They are now trying to assault Izraa.

Some of the rebels were vetted by the CIA as "moderate Muslims" and subsequently trained and armed in Jordan, as part of a US-led program to bolster a non-sectarian opposition to President Bashar-Assad.

But past experience has rendered such distinctions irrelevant to Izraa's Christians. After all, in Syria - and on this frontline - the "moderates" continue to work in alliance with Nusra. And the conquest of other Christian villages by the opposition has shown that more moderate factions frequently do little to stop the jihadists imposing their will.

"It's simple," said Father Elias Hanout, 38, who led the prayers at Sunday's service. "If the West wants Syria to remain a country for Christian people, then help us to stay here; stop arming terrorists."