People in the U.S. are leaving and switching faith traditions in large numbers. The idea of “religious churning” is very common in America, according to a new survey from the Public Religion Research Institute (PRRI).

It finds that around one-quarter (26%) of Americans now identify as religiously unaffiliated, a number that has risen over the last decade and is now the largest single religious group in the U.S. That’s similar to what other surveys and polls have also found, including Pew Research.