The last Christian man in town goes to church each morning to clean the building and to remember the past. Romel Hawal, 48, was born in this town in Anbar Province back when most of the population was Christian. Now, he said, his 11-year-old son knows no other Christians and has no memory of attending a church service.

“When my son swears, it is on the Koran, not the Bible,” Mr. Hawal lamented.

His wife wants to leave town or leave the country, joining what is becoming an exodus of Christians from Iraq and throughout the Middle East. But Mr. Hawal said he felt an obligation to stay. And he found support from an unlikely source.

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