I'm going to stop right there for a moment (print it out while I still have power =) and state my belief the cosmic clash will come between East and West (on whose faultline is Russia and her vast melting pot which was brought to a boil, IMHO, by the militant atheism which so distinguished the futuristy and the Narodnay Volya's terrorist vitality from the spent and decaying "Enlightened" who were Revolution's progeny in the West proper.)
The Western Energy that Dethrones Tyrants (it's NOT the perverted bloodlust of the French Revolution, btw =)
Not that we aren't working very hard to destroy ourselves (further to last night's comment on useful idiots): The West's War on Christianity Goes Largely Unreported
You said East and West and then qualified it with militant atheism. In effect admitting religion: a set of beliefs concerning the nature and purpose of the universe... is at the core of the conflict.
Read on. The foundation of culture/civilizations can be rooted in religion. And the conflict can be based on those same principles.