Well, I'd say the idea that "Western civilization" begins from the Greeks to modern today can be debated. Wasn't it Foucault who said that history exists in discontinuity rather than continuity?

I'm not the most capable person to explain further. But your question makes a number of assumptions. So here are a few related threads to look into:

http://www.reddit.com/r/AskHistorians/comments/22dtst/is_it_fair_to_say_that_chinese_civilization_is/

http://www.reddit.com/r/AskHistorians/comments/2szt04/where_does_the_idea_of_western_civilization_come/

http://www.reddit.com/r/AskAnthropology/comments/2ycznx/why_do_modern_societies_in_general_view_sex_and/

http://www.reddit.com/r/AskSocialScience/comments/2lp1bx/could_there_ever_be_such_thing_as_setback_of/