MONTREUIL (France): Mohamed Aboulbaki unfurled the design sheets for a gleaming new mosque where Muslims from ethnically-mixed eastern Paris and its suburbs could congregate, away from the cramped prayer houses they now frequent. “The Catholics, Protestants and Jews all have a place to pray in dignity. Why not us?” asked Aboulbaki, showing the modern minaret that would change the skyline in Montreuil, a suburban town east of Paris. “Islam is the second largest religious group in France. Surely we can have a decent place,” he said. After four years of debate, the first stone for the Great Mosque of Montreuil...