If you mean a harmonious life, when we are all brothers and sisters, then many people already live like this. Every religion has seeds of truth. Those who come to this understand that God is one for all religions, that this is Love in different manifestations. About different peoples - yes, we are all different, no one argues with this, but it's great that we are all so different! We all just need to start with our own development, start acting according to our conscience in every moment, and then everything will be fine.