Original settlers of what became the United States envisioned the land being "a city set on a hill." The nation would be an example of religious liberty and righteousness. 

Is the country still fulfilling that mission? Or are we too concerned with avoiding exceptionalism? Or do we no longer believe in religious liberty?

Belief systems are far more diverse than in the past. And I don't know if they can all be reconciled into a single unifying system. 

But perhaps a new awakening is on the way. Let's stay tuned.