That revolutionary event is, after all, what we mark our calendars by. A full two thousand years ago, God stepped into time. When Jesus of Nazareth passed from a Jewish virgin's womb into a manger in Bethlehem of Judea, an eternal era dawned. No turn of any millennium to come could carry appreciable significance after His arrival. There is a very simple reason why proposing a faceless merger of all religions and philosophies will never work.
Man is inherently an aggressive sinner by nature, choice, and practice.
He is totally incapable of creating God-vacant religious systems that actually work. One does not have to waste time arguing this point. But there in that manger lay a singular solution. Since the problem is sin, the only solution, then, is a Savior. An Answer to a Safe and Sound World Artificial destruction of national boundaries will never produce the universal kingdom envisioned by well-intended peacemakers.