Dozens of people were crammed into a tiny mosque in Piagapo, southern Philippines. Two weeks ago, heavy rain fell on the modest mosque with bamboo walls and a cement floor. "The mosque must not be given a name," said Gacap village’s headman Saiben M. Abubacar. "If it’s given a name, our customary elders will be angry at us."

The nameless mosque is surrounded by wooden houses. Middle-aged men, boys in sarongs and caps, and women in head-scarves g