Thanks for the info. The former mainline Protestant denominations are dying, so it’s not surprising they don’t get many people moving in who are going from denom to another.
The Pew Research center did a comprehensive study on this in 2016. The least likely group to be secular are Black Americans. Hispanics are very similar to White Americans in terms of religious trends.
http://www.pewforum.org/religious-landscape-study/religious-tradition/unaffiliated-religious-nones/
You can look at the data yourself. THe U.S. Population was 325.7 Million in 2017. Using the reported secular figure of 23% of Americans are secular-none, that means 74.9 Million Americans’ are secular. Of those 74.9, 68% are White non-Hispanic, 13% are Hispanic (including all races), 9% are Black and 5% are Asian (lowest). The White non-Hispanic population was 198 million, the Hispanic Population (all races) was 57.5 million, Black population 46.8 Million and Asian (all ethnic groups, Indian, Chinese, etc) was 21.4 Million in 2017. So that means 50.9 Million White non-Hispanics are secular (25.7%) and half of those are Catholic (former). 9.62 Million Hispanics (all races) or 17% of Hispanics are secular. 3.75 million Asians are secular or 17.5% of that demographic and Black American are the least secular Black as 6.74 Million or 14% of that demographic is secular.
So as I said earlier, Hispanics (all races) are trending similar to the White Non-Hispanic Demographic, as are Asian Americans. Black Americans, who are overwhelmingly Protestant, are the demographic to date least likely to be secularizing at increasing rates.
Living in the Southern U.S. all my life, driving to Mass on Sundays and passing other Churches, I have always observed the Black Churches are full (based on those leaving their Sunday worship services) and cars parked. My anecdotal evidence indicates the congregants are overwhelmingly Women. If they are Men there, they tend to be the older generation.
One correction, about 15% of U.S. adults are former Catholics according to a 2015 PRRI study. that is 48.85 Million. So if Half of Former Catholics are secular, that is 24.25 which means of the 74.9 million secular Americans, about 1/3 of them were Baptized as Catholics, which of course means 2/3 were from some other faith tradition.