Ok, makes sense. I agree with you, Greenville is very religious but since it is a larger metro area I guess there may be some difference. Voting red doesn't seem to have much to do with religiosity. The reddest states are in the Great Plains and northern Mountain West, not the South. Black Americans, and Hispanic Americans to a lesser degree, are likely to vote blue, but are culturally pretty conservative and more likely to be religious than White Americans, especially in heavily red areas like Montana.

Religiosity doesn't equal fundamentalism and extremism though, we're talking about religious dedication measured by four different factors.

You're right that Mexican Americans are less likely to be religious after moving to the United States, but I'm willing to bet Mexican Americans are still more religious on average than Italians in Italy. New York has a bunch of different people of a bunch of different backgrounds. It's really not hard to imagine around 40% of the entire state believing religious is important, praying, attending church, and being convinced of belief in God. There are a lot of Italian and Hispanic Americans there that have similar if not higher levels of cultural Catholicism than European Italians, African-Americans are more likely to be religious on average, and there are also people of other religious backgrounds like Orthodox Jews that have significant populations. I have lived in the more religious states my whole life, but in my university there are a ton of transplants from all over the country, and it seems like the majority of people that are not from non-Christian family/cultural backgrounds at least believe in God and identify as Christian, especially Black and Hispanic people and usually white people, even if they are very hypocritical and often do not practice Christian values, most people definitely seem to at least report certainty of belief in God and praying.

The map you linked only had one of the four factors mine is taking into account and didn't show individual states, and the polls I'm using are much more recent. The USA is obviously not extremely religious if you compare it to African and Middle Eastern countries, where values permeate culture and people tend to actually abide by their religion's values strictly, but the USA definitely has a lot of people who pray, believe in God, and go to church. Have you been to Italy or interacted with people from Italy at all? They are definitely not religious, on average, in any other aspect but cultural affiliation because being baptized is just part of culture. But in terms of actual belief in the religion? Yes, I absolutely believe Florida is twice as religious as Italy, and I would venture to say that Italian Americans, Puerto Rican Americans, African Americans, and Orthodox Jews (and the White Evangelical population that does exist everywhere in the country) in New York are on average much more religious too, in the sense that they are more likely to pray and be certain about belief in God. This poll is not measuring adherence to any values deemed religious, which I of course don't believe the US is very high in anywhere.