Kasensero, UgandaOn the edge of town, Ssebulime Kisakye is building a church. Behind the closed fish-processing factory, on a quiet beach covered in scraggly grass, he has erected a frame of raw timbers and a rough-hewn pulpit.

“It is important for my church to be here so that the lake can cleanse sinners,” he says, wearing a clerical collar and looking through the outline of walls at Lake Victoria. “These are people who have done bad things.”

But along the shores of this 26,600-square-mile lake, the second largest freshwater body in the world, separating the good from the bad and the saints from the sinners is a complicated task.

The sinners Kisakye has in mind are the fishermen who, enabled by corrupt officials,