NAIROBI, Kenya (RNS) — Two years ago, a Catholic priest and his driver set out on one of the most dangerous roads in South Sudan and were never seen again. Now​, church leaders in the country say they want to know what happened to the two, and they’re putting a spotlight on the growing number of disappeared in the country.   “It’s ​a question of justice. We want the government to take its responsibility regarding the disappearance of these two. They are not alone; many people have also disappeared,” said Catholic Bishop Eduardo Hiiboro Kussala of the Tombura-Yambio Diocese​ in South Sudan.   The Nagero-Tombura Road in South Sudan is a critical transit corridor that priests and pastors travel to bring the gospel to remote South Sudan communities, such as Western Equatoria. The road cuts through territory where armed men commit deadly robberies, kidnappings and other attacks.   It is on this road that the Rev.…