You have no idea how accurate and profound your statement is. The mid 1800s religious extremism still survives in the US and plagues its public discourse and institutions in the form of anti-intellectualism.
https://en.wikipedia.org/wiki/Anti-intellectualism#United_St...
The American anti-intellectualism is far stronger compared to all the forms of anti-intellectualism across the world, and its surprisingly wide-reaching - a lot of the anti-intellectual behaviors of the religious American crowd of 1850s survive today and manifest themselves in different forms. From opposing science to conservatism in silly things like the resistance to the metric system and more.
English engineers much prefer a 12-based system where you can design, construct and build easily— dividing measurements by 2, 3, and 4– where practicality is foremost.
I do think French atheism is at the root of it yes.
P.S. completely trolling/kidding! P.P.S. Long before the metric system, the French were calling a dozen dozen “grosse”. The prejudice goes long back and it isn’t from us Angle-iPhones.
Hell yeah it is - the never-ending English, later British propaganda against France goes back 600 years. Against Spain, it goes back 500 years. A lot of that seems to have been carried over to its former colonies.
But today it just seems hardheaded. And it's not just metric...you have ANSI vs ISO, electrical systems, 4g and 5g radio bands, etc. With a world population 20 times the US population, I foresee a lot more companies just deciding it doesn't make financial sense to bother with the US market. We already see that with smartphones.
I just erased a long rant about this, because no one needs to read another one.
But I'll summarize: Our refusal to adopt the metric system is really a symptom of everything that's wrong with the country today. I blame organized religion.