True Religion Basics.

Humanity and our society didn't grew up in a day, month or year. It's a very long process. How did the universe got created? How did it evolved to today? It's a very long history.
However we can get some of the facts about the creation and evolution of the universe and humanity through The Vedas, The Puranas and later literature. It were planning of the creator to create deities, handover their own duties of creating and sustaining this universe to them and then run this universe according to True Religion.
Ever since The Almighty Creator or The God remained invisible. However His deities came into visible form and performed their own duties to help in creating this universe. How should this beautiful world and universe be sustained? The mere answer being Truth, deities were truthful and promising. They used to keep their words unlike humans of today.
Deities had channels as well. Therefore it came into practice to obeying the commands from superior ones. Since only superior deity were supposed to know the rest. The same process adopted by humanity and societies as well. Today also we see that process of obedience, however somewhat modified or ruined if you say so.
Since The Almighty God and Creator were True hence there is a flow of Truth in ourselves or The True Religion. It can be considered as a bond of rare truth to mere truth. A bond of creatures to The Creator and likewise.
Religion also means duty in a way. It also means a way of life or art of living, a bond of humans and divine etc. However literally it comes out to mean reunion or yoga i.e. to reunite ourselves to the Almighty.
Therefore True Religion has similar meanings but stress being on the Truth. Thus True Religion comes out to mean "True way of living" or True Reunion to The Almighty.