You would have thought that the population of the US was headed toward a godless future reading this stat from 1992. But compare this first paragraph to a the second which is a Pew poll. Not much has changed. The good news here is that America remains a wonderful field for evangelism and change.
1992
In "One Nation Under God," a statistical map of American religion, summarized in the November 29 issue of Newsweek, Barry Kosmin and Seymour Lachman of the City University of New York have assembled data from 113,000 respondents, by far the most comprehensive random sample of detailed religious preference ever collected. The survey determined that nearly 1/3 of the adult U.S. population (18 and over) is now "totally secular" in its spiritual outlook! It also found that only 19 percent of adult Americans about 36 million people regularly practice their faith. The rest are described as "moderately religious" (22 percent), "barely" or nominally religious (29 percent) and agnostics and atheists (7.5 percent). The survey has an important message for the religiously and politically conservative who are interested in reversing the downward cultural spiral. It is unlikely that the 19 percent whose faith affects their lives and world view can change the moral and social conditions of our country through political means alone.
2019
The religious landscape of the United States continues to change at a rapid clip. In Pew Research Center telephone surveys conducted in 2018 and 2019, 65% of American adults describe themselves as Christians when asked about their religion, down 12 percentage points over the past decade. Meanwhile, the religiously unaffiliated share of the population, consisting of people who describe their religious identity as atheist, agnostic or “nothing in particular,” now stands at 26%, up from 17% in 2009.
https://www.pewforum.org/2019/10/17/in-u-s-decline-of-christianity-continues-at-rapid-pace/