How does the book "The ClashCivilisationsions" apply to the identity perspective?

Have you read the book? Wikipedia has a good article on it, plus there are other sites that explain.

"The Clash of Civilizations (COC) is a hypothesis that people's cultural (https://en.m.wikipedia.org/wiki/Cultural_identity) and religious (https://en.m.wikipedia.org/wiki/Religious_identity) identities (https://en.m.wikipedia.org/wiki/Identity_(social_science)) will be the primary source of conflict in the post-Cold War (https://en.m.wikipedia.org/wiki/Cold_War) world."
https://en.m.wikipedia.org/wiki/Clash_of_Civilizations