> The same logic applies to all right-wing parties. "America first" might sound good to an American surrounded by other Americans, but it won't be received well in an Internet forum where many people are not American, and won't become part of the global discourse because it's completely irrelevant to the vast majority of humans.
There's a lot more to conservative thought than "my country first". Right-of-centre people from different countries can find many things to agree on other than that. Even when it comes to that topic, many (but far from all) people on the political right believe that "everyone ought to put their own country first", and people from completely different countries can share their agreement with that principle, even if sometimes its application leads them in opposite directions.
Consider issues around gender and sexuality: in most countries in Africa and the Middle East, and also several large countries in Asia, you'll find the clear majority of the population to have rather conservative attitudes to these topics, by Western standards. On those issues, I think it is likely that right-leaning Americans are closer to global majority opinion than left-leaning Americans are.
Coming to religion, a conservative Shi'a Muslim in Iran and a conservative Orthodox Christian in Russia likely agree on a lot more than you seem to think–despite their obvious disagreements on theological questions. They may think that their agreement that the government ought to promote and favour conservative religion is more important than their disagreement over which one. They may even be willing to agree, "I'll support your theocracy in your country if you support my theocracy in mine".
Conservative religion is a lot stronger in the developing world than the rich West, which is another way in which right-leaning Americans are likely closer to global majority opinion than left-leaning Americans are.