Most churches today have not been able to seize this simple idea of rallying around a common purpose because our culture of individualism does all in its power not to let it happen.
I agree. I'm not sure that 20th and 21st century culture bear the whole blame, though. I believe church leaders over the past few decades (and centuries?) have failed to convey through teaching and preaching the same message of the kingdom of God that Jesus conveyed. By not doing so, what other choice do believers have than to believe, yet conform to many of the same values of the society in which they are already entrenched?