Well, I take your point about multiculturalism (I think). But you don't have it quite right. The Western tradition that has given us all the great things you note predates Christianity and, of course, found its origins in Ancient Greece and Rome. That's not to say Christianity hasn't been a part of that Western success - it has, tremedously - it's just that Classical Greece and Rome birthed it, and Christian Europe advanced it, and primarily we stand on the shoulders of the Scottish Enlightenment.
And, the whole "white" angle simply isn't true, except as historical correlation to the successful culture - and while it is true that the predominant ethnicity of this great Western success is European-esque/Caucasian, the biology of race has been completely irrelevant of any of the success (or failures) of civilizations.
Also, the case for the Near/Middle East contributions to knowledge and the success of the West (as is usually remarked, "during the Dark Ages") is overstated, and these overstatements are typically the result of political correctness.
Multiculturalism is nonsense on stilts - this idea that cultures are all kinda "equal" is not only idiocy - believing in it is cultural suicide (and would be for any culture, for that matter - what other culture obsesses with the fact that "it is simply no better than any other culture" than does America, and some of Europe?). But with that in mind, a rejection of multiculturalism can never be disguised racism, and I hope that isn't where you were headed.
Because if it was, I would be inclined to say something downright unpleasant.