The following is excerpted from an online article posted by Gallup.
The vast majority of U.S. adults believe in God, but the 81% who do so is down six percentage points from 2017 and is the lowest in Gallup’s trend. Between 1944 and 2011, more than 90% of Americans believed in God.
Gallup first asked this question in 1944, repeating it again in 1947 and twice each in the 1950s and 1960s. In those latter four surveys, a consistent 98% said they believed in God. When Gallup asked the question nearly five decades later, in 2011, 92% of Americans said they believed in God.
A subsequent survey in 2013 found belief in God dipping below 90% to 87%, roughly where it stood in three subsequent updates between 2014 and 2017 before this year’s drop to 81%.
In the most recent poll conducted between May 2-22, 2022, 17% of U.S. adults reported they do not believe in God.
Source: Gallup
https://news.gallup.com/poll/393737/belief-god-dips-new-low.aspx