So you have a "Hollywood fight" theory. In a Hollywood movie when the good guy is surrounded by bad guys in a fight, all but one never engage the good guy at once, they wait till one goes down and then the next one steps up. So you think that the Celts, whose descendants rule the world now just sat around and did nothing hidden away somewhere while the Israelites, Assyrians, and Babylonians all got off the stage. The same peoples that ruled the world in 1000 BC rule the world now.
I didn't realize the Celts were running the show, but then "the Celts" seem to be practically everybody in your world, much more so than in mine. I suppose that if everybody is everybody else then your statement cannot be contradicted. But what happens if the Chinese are the big power in the coming decades? Or are they the Lost Tribes of Israel also?