There is a very long future in which he can make nations tremble again. Atreyun is basically starting over and, well, that means starting small. One believer is better than no believers. Atreyun isn't greedy.

"Show me the way." If Akihito can't make it steadily the whole way, Atreyun will assist further. Whether it be in the form of an arm around the boy to support him or flat out carrying him. No matter what, Akihito will reach his destination.