While the statistic on atheist or agnostic self identification is fairly accurate, I think it is misleading. There is a lot of stigma against these terms in the U.S., and many people who hold beliefs inline with what would generally be considered atheist or agnostic do not self identify as such.

A 2017 Pew Research survey found that 18% of Americans consider themselves "neither religious nor spiritual" and that a further 27% consider themselves "spiritual but not religious" [1]. In total, roughly 45% of Americans consider themselves "not religious". Given the historical trends in the U.S., I suspect these numbers are even higher now.

https://www.pewresearch.org/fact-tank/2017/09/06/more-americ...

If you define Christian to mean someone says “yeah I’m a Christian I guess,” then perhaps. If you define it to mean someone actually studies the teachings of Christ and tries to live by them, there’s no way it’s more than 10-20%. If you go to church you’ll find most people there come infrequently as a purely social thing and don’t really listen or care about the philosophy much.

My conversations with Americans were on reddit exclusively, so those statistics are very surprising.

The ownership of the media, or any other industry, is hardly representative of the overall population.