Friend Alceste,
What you state is true HOWEVER you may have realised that humans are more tolerant of caste, creed, colour, race, nationality, etc. much more than before; now we recognise each other as humans BUT the GREED which is there in the minds are difficult to remove as they are mere thoughts and it is effort of all religions to understand that only in a thoughtless state does merger or real unity with the individual and the whole takes place.
Yes, this too will happen but when is not known as only then can the human species evolve to a higher state of BEING.
Love & rgds