Lineup of Entities/Religions in Syria Crisis

During the Syrian crisis -- before the last-minute Russian solution came up -- I was reading about the beginning of World War I. (Remember, 37 days after the assassination of Archduke Ferdinand, Europe was plunged into a savage war that almost destroyed European civilization.) The inexorable decline into World War was caused by pre-assasination alliances. So I got to thinking about how the sides would line up if a World War III started with some unexpected development in Syria. (Hope my table survives DU formatting!)


POLITICAL ENTITIES
Assad / Anti-Assad
Syria / Syria Rebels
Russia / US
China / Gulf Emirates
Iran / Saudi Arabia
/ Muslim Brotherhood
/ Israel

RELIGIONS
Sunni / Shiite
Christian /

I'm no Middle East expert, just have a boxtop knowledge from the papers. How close am I? Corrections and additions welcome.