Let's talk about "God Bless America" became a general statement pepole shared due to Irving Berlin writing a song of the same name. Here are the lyrics:
While the storm clouds gather far across the sea
Let us swear allegiance to a land that's free
Let us all be grateful that we are far from there
As we raise our voices in a solemn prayer
[Verse]
God bless America, land that I love
Stand beside her and guide her
Through the night with a light from above
From the mountains to the prairies
To the oceans white with foam
God bless America, my home sweet home
God bless America, my home sweet home
Do people use it differently now? Yes. It can have very heavy religious connections to forms of Christianity that--in my opinion--fucking suck.
Let's look at the song itself and the man who wrote it.
irving Berlin was born in Russia in 1888. He wrote God Bless America in 1918 (it was made most famous in 1938 as a fuck you to Hitler). His family immigrated to the US in 1893. Why? Because of pogroms against Jews in Russia. His family fled Russia to America to take the chance of a better life where they would not be hunted for being Jewish.
Was it perfect? No, absolutely not. I don't have any particular situations to give you. I just know how antisemitism works and particularly know how it worked in the US pre-WW2 because I've read/watched things about WW2 and how it happened from every direction for 30 years.
In 1918, the son of Jewish immigrants, Irving Berlin--a Jew himself--wrote God Bless America identifying himself as an American and America as the land of the free. He called it his home.
Now, in many places for even modern-day history, an immigrant calling their adopted country their home was and is still met with derision and possibly country-wide violence (which I note specifically because the US does NOT have country-wide violence against immigrants in the modern day). One of the things that makes the USA stand apart from the rest of the world is that while our politicians love to try and pretend like we are not a country that loves and wants immigrants, our population in the majority (again, a terminology use to show I know we've got anti-immigration assholes in the population) wants to hold that ideal and protect it fiercely.
God Bless America is played at baseball games. High school bands learn it for football seasons. It's been covered and re-covered by much lesser artists than Irving Berlin, and it has (to pull the pin) 100% become a thing the worst Christians in the US say while missing the fucking point.
In fact, Americans in general believe in the right of immigrants to come here, build a life, and become American so much that we do not fuck with the idea that we should be culturally sensitive to acts that harm other people in that culture. In general, if Americans find out an immigrant has harmed someone in their own community, the excuse of "Well, their culture says it's fine," the response from American is "Well, they don't fucking live there now, do they." If your "culture" allows harm to another human being in your communities, Americans tend not to be for it.
I cannot stress enough that I am NOT saying the USA has a perfect record in this. I was 18 in 2001. I remember plenty of shit. I have read the history of my country. I know where we have failed. I am saying that, in general, American citizens will support and be friendly with their immigrant neighbors as long as their neighbors are willing to assimilate to the point of American expectations of not harming other people. Depending on the American, that expectation can shift (For example, no, I do not think anyone should be forced into an arranged marriage. However, fundamentalist Christians would likely find a lot of common ground between arranged marriage and their ideas of "courtship").
No one who says "Death to America" should ever be respected in the United States. But also, no one who says "Death to America" should be imprisoned just for saying it because we have free speech in our constitution and that includes the right to say shit that implies violence that is NOT a direct call for violent action. That being said, if someone uses their own free speech to show the "Death to America" free speech person that they'll get punched in the mouth for the shit they say, the puncher should 100% be arrested for assault and face charges, but also, on an emotional level, I get it.
If you are standing in America saying "Death to America," there is absolutely and completely something inherently wrong with you as a person in America. It is the absolute opposite of what anyone (including the fundies) mean when they say "God Bless America." They are saying "I am so glad and lucky to be here." And "Death to America" is saying "Death to America."