HASAKAH, Syria—Just outside the small Yazidi village of Barzan, in northeastern Syria, 10-year-old Shadi Rasho stood up to recite a prayer. His light but melancholic voice continued for a few minutes as the room listened in silence. “This is what children who stay here can do,” said Shadi’s older brother, 21-year-old Souliman Rasho. Most of the family’s relatives have left for Europe—driven away by the discriminatory policies that Syrian authorities enforced over decades and persecution by the