DEIR BILLA, Lebanon—Christians in this small northern Lebanese village keep a lookout at night for unwanted visitors, asking drivers headed up the hill toward the Shia part of the neighborhood what their purpose is. They have installed cameras and often sit around until 3 a.m. smoking shisha, keeping an eye on the road.

       “They know we are watching," said Farid Sammour, a 31-year-old restaurant owner. “Before we were living together. Now there is no trust."

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