This Map Shows The Dominant Religious Group In Every US County

[Igel]

55. Diversity.

In a lot of areas there are dozens of smaller denominations. 10% of the population being Catholic might be enough to make Catholicism dominant.

Houston has a lot of Baptists (mostly blacks, some whites). And Episcopalians (mostly whites), esp. in the area I live and work in. Plus a fair number of Methodists (just up the street a ways). And the Mormons have a strong presence, with their own Scout troop and stake. My area has a mosque because of a S. Asian population. Strip out all the Latinos, and there are white Catholics. Nobody has more than a perhaps 25% "market share."

Now add in even the 15-20% Latinos in the area, and call them an even 10% Catholic. Suddenly they're the largest single group. The more even the split, the easier it'll be to have them push Catholicism over the top--which may be as low as 15% in some places in the Pac NW.