text: "...if ex-Catholics, were a denomination, would be the second largest."
  
  If they were to form such a church, it would prove interesting, to say the least. Let's say they formed a Catholic community or church not in communion with Rome. So in "ecclesial block" categories, 21% of the US would be members of the RCC; 10%, the non-Roman Catholic church ( together, comprising 31% of the population in some sort of Catholicism); and 38.9%, Protestant. That would bring Tocqueville's prediction -- that the US will eventually be all Catholic (of some sort) -- even more closer to home, as it were. But ex-Catholics have formed no such church. They are scattered all over the map, everywhere -- half to some form of Protestantism (to hundreds of denominations) and/or to some non-Christian religion and the other half to the unaffiliated category. Had ex-Catholics formed a single church, however, the Catholic/Protestant divide would only be 8 percentage points.