Less than half of England and Wales population Christian, Census 2021 shows

[Ranjr]

I don't see a percentage for atheists.

Let's see what we can find.  

About Three-in-Ten U.S. Adults Are Now Religiously Unaffiliated



You asked for avowed atheists.

1The share of Americans who identify as atheists has increased modestly but significantly in the past decade. Pew Research Center telephone surveys conducted in 2018 and 2019 show that 4% of American adults say they are atheists when asked about their religious identity, up from 2% in 2009. An additional 5% of Americans call themselves agnostics, up from 3% a decade ago.

So everything is fine.  Preachers still have jobs for now.