Whenever Donald Trump Era ends, what will America's religion landscape look like?

“Trump is toast.”

So proclaimed National Review’s Andrew McCarthy after the most shocking Republican Party flop since, oh, 1948, which was followed by the least shocking Republican event imaginable, Donald Trump’s Tuesday announcement of a third run for president.

McCarthy joins a significant lineup of conservative pundits and media in blaming the GOP’s embarrassment on Trump and his demands for 2020 election denial with resulting candidate picks. Democrats took the Grand Rapids, Michigan, area by 12.8%, for goodness sake. The former federal prosecutor contends that Trump has not only surrendered his 2024 chances but is certain to face federal indictment.

Well, no matter what such elite conservatives suppose, Trump retains a massive grassroots following. However, the first post-election poll of Republicans and Republican leaners, from YouGov, put Florida Governor Ron DeSantis as the 2024 front-runner with 42% to Trump’s 35%. A month earlier YouGov gave Trump 45% vs. DeSantis’s 35%. A poll of Texas Republicans was similar.

An intriguing Wall Street Journal package recently offered scholars’ speculations on what Russia will look like in the long term whenever Vladimir Putin’s reign ends. The media could borrow the idea to explore what the American religion landscape might look like when Donald Trump no longer rules the Republicans, whether that’s in the primaries or Election Day 2024, or Inauguration Day 2029.

If you grab the theme, also run this one past your sources: Has this secularized, former Mainline Protestant and onetime “reality” TV personality had more impact on American religion than any member of the clergy during these years?

Other assorted post-election musings.

As GetReligion often observes, Catholics are the swing vote to watch, since white evangelicals are locked into lopsided Republican loyalty (this long before the Trump years).

Any kind of turnaround for 'Mainline' Protestantism would be big news, but is it true?

One danger facing religion-beat veterans is that a broad trend becomes so familiar we overlook its continuing journalistic importance. One example is the year-by-year-by-year decline of America's once-influential "Mainline" Protestant churches over the past half-century, even as conservative or "Evangelical" Protestants generally kept up with population growth -- until recently.

(For additional background, please note that the June 24 Guy Memo lamented media neglect of Mainline angles in spot news coverage. See also this recent Ryan Burge post.)

The Mainline shrinkage is one of this era's momentous changes in American religion, a great void in the public square into which evangelicals moved. Other major trends include the substantial rise of unaffiliated "nones," immigration-driven increases in Hispanic Catholics and followers of Asian religions, and white Catholics' shift from loyal Democrats to pivotal Republican constituency.

It's big stuff if that Mainline Protestant slide has bottomed out or that’s any kind of upswing. And what if Mainliners now suddenly outnumber the rival white Evangelicals (leaving aside the distinctive Black and Hispanic Evangelicals). Such is the scenario in a major new survey released July 8 by the Public Religion Research Institute (contacts at press@prri.org or 202-238-9424).

PRRI tells us that white Mainliners are now 16.4% of the U.S. population, a remarkable gain from 13% as recently as 2016, while white Evangelicals have fallen to 14.5% from a 23% peak in 2006. White Catholics constitute a pretty stable 11.7%.

Politically, Mainliners are divided and thus have less clout than other groups, identifying as 35% Democrats, 33% Republicans, and 30% Independents.

As journalists ponder what to make of this surprising report, begin with what's “Mainline” in the church marketplace. The Guy (and others) say the word designates those Protestant denominations — the so-called “Seven Sisters” — born in Colonial America or the early Republic, with predominantly white memberships, that are affiliated with the National Council of Churches and are tolerant or favorable toward liberal belief. We could add that the well-educated Mainliners typically enjoy relatively high incomes and social status.

Here is the key: This PRRI survey at hand identified Mainliners by what they are not instead of what they are.