The canyon in central Mexico was ablaze with torches as hundreds of people filed in. So palpable was their shared shock and grief, they later said, that neither pastor nor priest was needed. The event was a memorial service for one of their own who had died during an attempted border passage. Months later a survivor emerged from a coma to tell his story. The accident had provoked a near-death encounter with God that prompted his conversion to Pentecostalism....