And a report in the Economist points out (for what it's worth) that many denominations are closing churches:
'' What is a shepherd without a flock? Many of America’s pastors may soon have to answer.
Quote: "In 2014, 3,700 Protestant churches closed, by 2019 that figure was 4,500, according to Lifeway Research, a non-profit organisation that provides resources for ministry. Many parishes simply do not have enough congregants to pay the bills. In 1972, 90% of Americans called themselves Christians; now just 64% do. The waning of religiosity in America is not new, of course. But newly released data shed light on where religious adherence has dropped most, and among which Christian denominations."
Are the stats reliable? Well, they come from a source, that could be described as 'friendly'
Quote: "Every ten years the Association of Statisticians of American Religious Bodies (asarb) attempts a tally of membership for every church in the country. It is a monumental feat of data-gathering, covering hundreds of religions and thousands of congregations. Figures for the 2020 census are now finally available. They issue a stark warning to the country’s “mainline” Christian denominations: membership of these old churches, such as the Methodists, Lutherans and Episcopalians, is shrinking at an alarming rate. Whereas the ranks of all religious Americans rose by 10.6m believers (7%) from 2010 to 2020 (when the overall population grew by 7.5%), the number of Episcopalians and Methodists dropped by 19% each, and the Lutherans plunged by 25%. Presbyterians, a Protestant group characterised by disdain for flashy ceremony, lost nearly 1m (40%) of their members
Source: https://www.economist.com/united-states/2023/04/20/american-religion-is-becoming-less-exceptional