Personal and cultural mass (ego) Identity is only individualistic separation from all other comparative human personal or cultural identities, always creating conflict. That is why Einstein taught that human separation is a false ilusion: all humanity is one and part of the Universe, we are the Universe itself.
Many years ago i also referred to that same revelation myself by intuitively writing about it. So Albert E. in his third stage of spiritual evolution, recommends meditation to discover that already existing TRUTH in each human being. While Albert Einstein correctly reveals the first religious development stage of bible addiction, church going as a mass security dependency complex, as literally ! "infantil" and even "stupid" !. Hard provoking but true words indeed. Therefore i personally rather prefer to apply the words: "blinded by temporary innocent, naieve ignorance", before experiencing the still hidden conciousness Cosmic Universe Awakening Truth.
Arie Johannes Geurts Verstegen, There is a difference between the universe and the source and cause of the universe that is the indesribable Brahman. Humanity can only be one if all human beings identify themselves with that eternal Entity Brahman. If they do always operate from their minds which are all different in all human beings there is bound to be conflict between human beings. The mind is not an illusion but is God and different people have different conceptions of God so they fight among themseles necessarily for domination and supremacy like animals that are humanimals. Meditation is still a mental pursuit so trying to unify humanity under the same umbrella is impossible unless they all have the same Personal God. And that requires vows as in Buddhism. Far simpler process for unifying humanity is for everyonento give up their minds and identify with the eternal Brahman in advaita.