Whatever divides people in Greenwich from people in Bridgeport or Danbury or Connecticut's pagans and Christians tends to get submerged in the greater North-South or East-West animosity, and people find fewer reasons to buck regional trends.
If by "it", you mean to refer to the Great Divide in American culture, "it" does not come down to faith alone. As I said, it is a divide between those who embrace both faith and reason on one hand, and those who embrace nothing on the other, and by "nothing" I mean nothing but want and need, which is the state of most animals exclusive of Man. And yet, that is the very state of the Left today regardless of geographic location.
A lot of very smart people, many of whom live in Eastern enclaves, but many others of whom live on the West Coast or the cities of the South and Midwest, have come to embrace a sort of nihilistic pre-philosophy that makes them sublimate their intelligence in favor of a collectivist mindset. Why in the world would wealthy, successful people do this?
Life is not fair and many Elitists cannot get past that fact, so even if they perceive themselves as "Winners" they demand that Government make life fair by appropriating the property of some for the benefit of others. Guilt complex, anyone? Of course, present company is always excepted, and by means of political influence and/or expert financial planning, wealthy elite Liberals still get to keep their summer homes in the Hamptons, but hard-working entrepreneurs from the wrong side of the tracks are punished as upstarts with bad table manners, who got theirs presumably by illicit means. The Elite cannot tolerate those who have become happy and self-sufficient through means other than inheritance, legal services, or arbitrage, and look down on those without class pedigrees or social status who manage to succeed without the benefit of either.
What many Elitists are missing is what makes non-Elites successful: Faith, Reason, and Effort: faith in themselves and in their Creator, reason to guide their decision-making, and a lot of hard work. Kennedys think they are successful because they are Kennedys; if they really had to work for a living, they'd think it beneath them. Work is for the little people: like those who trim their hedges in Hyannisport.