Having been raised in an anti-Catholic fundamentalist household, in a city predmoninated by good Irish and German Catholics, I admit to having rather more knowledge of internacine Christian strife than I would like.
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Anti-Catholicism has old roots in the US, dating back to anti-Irish nativists in the 1830s, and while it is distinct from the growth of what became the fundamentalist churches, it is contemporaneous. However, I do think much of it comes from antipathy on the part of groups threatened by immigrants (especially in New England and NY) but I also would point at the old hostility between the mainly Protestant Scotch-Irish here from the mid 1700's onward, not to mention the Anglican English, and the new arrivals via Liverpool.
A couple of things from skimming the posts: I think that if you were to ask an Irish Catholic, a French Catholic, and an American Catholic (and doesn't that sound like a bad joke setup?
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) who they were, the nationality and language would more often than not come before the religion. I would hazard a guess that this would be true in most parts of Europe and the Americas. This doesn't mean there aren't people who identify themselves as Catholic first and (your culture here) second, but that they are a minority. Anywhere. Everywhere. Except maybe Vatican City.
Currently, whether or not an attack on, say, the local archbishop, would be construed as an attack on Catholicism, or on Catholics, would depend very much on context, and the individual Catholics you asked. I am certain some would take it personally, but there is little doubt that most in the US would not. Otherwise, why would the clergy have to poke them, as they occasionally do, to tell them they SHOULD be upset?
The situation is very different for both Jews and Protestants. The latter do not have a cohesive structure, or rather, have hundreds of unrelated ones, many of which do not speak to each other. Launching an attack on Protestantism would be like bisecting a sneeze. The Jewish people, on the other hand, have a very strong cultural identity formed by a combination of sheer willpower and centuries of living on the edge of societies, or at least living there until they were needed as scapegoats for something and kicked out entirely. Part of the reason the Elders of Zion claptrap went over so well was because it was difficult for non-Jews to look at the networks of Jewish communities in Europe and NOT imagine a central authority.
One thing occured to me in relationship to how hated Christians are: I would be willing to bet a large sum of money that, if you totalled up the number of Christians ever killed for their faith, the most common perpetrators would be, in fact, other Christians. I think there is resentment and jealousy of Christianity as the dominant religion of the opulent and powerful West these days, sure...and probably hatred in some quarters, yes. But no one, I mean, NO ONE, is capable of hating a Christian like another Christian.
Finally, I would like to leave this discussion with words of wisdom from Tom Lehrer:
Oh, the Catholics hate the Protestants
And the Protestants hate the Catholics
And the Hindus hate the Muslims
And everybody hates the Jews
But during National Brotherhood Week
National Brotherhood Week
It's National Everyone-Smile-At-
One-Another-hood Week
Be nice to people who
Are inferior to you
It's only for a week, so have no fear
Be grateful that it doesn't last all year!