Perhaps hierarchical religions are turning people off. So many religions think they are the one and only true viable alternative, placing themselves on top of a religious hierarchy that they create.
NPR reports that the Pew Research finds that the religiously unaffiliated – a group comprised of atheists, agnostic and those who say their religion is "nothing in particular" – is now the largest cohort in the U.S. They're more prevalent among American adults than Catholics (23%) or evangelical Protestants (24%).
https://www.npr.org/2024/01/24/1226371734/religious-nones-are-now-the-largest-single-group-in-the-u-s