That is the Western way of thinking, after all one is a product of one's environment. In Islam, there is Ummah, under which shadow rests its dominion, with less emphasis upon the disparate idiosyncrasies in culture, cuisine, garb, language etc, and more emphasis upon the greater good.I know however knowing the differences between civilizations and religion is two different things.
You could say Russia isn't really a part of "the west"
Christian nations like Ethiopia and Philippines as well as regions such as Bantuweyn and controversially latin America are all Christian yet not western.
We are all part of the house of Islam but "civilisations" are more human than that if you know what I'm saying.
Cultures, language, ideology, geography all pile together to form a "civilization".
You look at the Sahelians and although they are Muslim and have similarities to the middle east. They are their own distinct civilization and peoples. That isn't to say they aren't part of the "House of Islam" but they are distinct from the middle east.
Same with the muslims of Malaysia and Indonesia who have their own ancient history and their cultures and identities seperate from the middle east.
As are the south asians with their civilisation starting in the Indus Valley in Pakistan.
And the Horners starting in the nile valley of Sudan but since moved to the Highlander abyssinnian and the Islamic empires of The Somali peninsula.
By claiming these distinct peoples as all one goes against millenia of history. We still work together as muslims or sometimes not. But we are still different. God made us into seperate tribes and those tribes formed their seperate civilizations.