Seems to me we agree more than disagree. You actually seem to be defending the melting pot, not the parallel cultures of multiculturalism.

The modern concept of nation didn't exist (and it means different things today in French and English), but the notion of "a people" certainly did. People have always spoken of "the Greeks", the "Phoenicians", etc. 
 
My sticking point isn't about 'preserving Judeo-Chrstianity at all cost", it is of preserving a shared culture, and in the West that means one based on Judeo-Christianity, just as in India it means one based on the Ramayana, in the Middle East on the Koran, in China on Confucius, in S-E Asia on Buddhism, etc.

"Are we open to adopting any good aspect of cultures around us or just the ones you like skyofblue? Rhetorical question, I know your answer."

What a strange comment. Who likes and wants to adopt aspects of cultures they think are not good?? You?