Well to answer that question, we'd need to ask what is a civilization
My answer to that is a mixture of culture and institutions
The cultures of the Greece/Italy (or at least that of Rome) placed the state as the most important thing. Below that is the clan(Clans can mean anything from clans as a family unit to a polis(not too sure on the last bit)). Finally at the bottom of the tier list comes the individual
If we contrast that with todays West, the culture places the individual as the most important thing, and the state next. As you can see the clan is no where in this equation.
IMO although the legacy of the Romans inspired the modern West in regards to philosophy and the like, I doubt that the Romans are apart of the West
This is very confusing. So, there IS NOT WEST then in your thinking at the time of the Romans.
Why, though, is Greece not considered a fore-runner of the West in this analysis? Or at least the democratic Greek states?
What, other than Greek democracy, is the origin of the modern individual-based state? It cannot be considered to be the feudal state, as this is a top-down institution#
People hark to tribal so-called democracy but tribes obviously have the heirarchy even if the taanist might be voted in, in some fashion.
So, unless you discount antecedents completely, you have to look to Greek democracy to some degree as the forerunner of the modern West