Last year 53% of people described themselves as having "no religion", in a survey of 2,942 adults by the National Centre for Social Research.Given the Church of England (aka "Anglican") is the state religion of the U.K., it isn't exactly an overwhelming favourite (British spelling intentional).
Among those aged between 18 and 25, the proportion was higher at 71%.
The most dramatic reduction has been amongst those who identify as Anglican. Some 15% of people in Britain considered themselves Anglican in 2016, half the proportion who said this in 2000, according to the survey.
Those identifying as Catholic has remained stable - at around one in 10 - over the past 30 years, while one in 20 people identify with non-Christian religions.
Developed countries all over the world are moving away from organized religion. It is happening here in the U.S. too, albeit more slowly.