That's true. The split between the Northern and Southern Kingdoms of Israel was brought about in no small part by "elements of exclusivity and intolerance". They just plain didn't like each other.
Those same people today are mostly Celts/Europeans/Americans/Christians (Northern Kingdom) and Jews (Southern Kingdom).
Okay, I'll bite. How is it that the Southern Kingdom has only about 15 million decendents, and the Northern Kingdom has about a billion (remember, many Europeans also settled in Latin America and Australia, etc.)
Even the Nazi Holocaust can't explain that disparity in population figures. If your theory is correct, the population numbers should be roughly more equivalent.