The "creator" god is actually fairly typicaly in a lot of ancient religions, that some god would come in, start everything, then back away. The concept of gods that gather their worshippers is probably most popular in norse mythology where the warriors go to the halls of their patron god to prepare for ragnarok.
Four words: Ragnarok Mode
a mode which enables a "new" type of religious victory.
I smell a mode type that could breath new life into the mid-game, war is practically guarrenteed