Christianity was to have brought it about, but it has not succeeded. Nations are armed to the teeth against each other. Universal brotherhood is not something sentimental. We are actually united and feel each other's thoughts and actions. The progress or the lack of progress of one community or one nation has its effect on every other in the world.
Theosophy is derived from Greek words meaning the wisdom of the gods.
The Christian Bible says that the gods created man. The word is in the plural. It does not mean a god of wood and stone, but natural forces, cause and effect, evolution, which has brought man into being as it has everything else. If you cannot believe that God is a being like yourself infinitely extended on the screen of space, but that all things are God, Theosophy means a knowledge of that. It is that which, if understood, will reunite religion and science.