I think it would be pretty fun to play a game where around 20-100 people are on a huge island and they have food/water/heat bars that they have to worry about. You get placed on the island with other people who chose the same religion type (Monotheism/Polytheism/Polytheism +)
Monotheism: One of these players get to be the god and try to cause Natural Disasters to try to kill everyone before they can escape via raft.
Polytheism: There are multiple gods who control different aspects of the world, they gain power points much quicker but say the god of water (Liquids) can only control liquids, (Not molten solids though) Nothing else. The gods would then have to work together.
Polytheism +: There are multiple gods trying to help the survivors and some trying to destroy them, pretty much the same as polytheism except it has good guys too.
Crusades: The Crusades game mode would be maybe 2 large groups (20-100) who fight with two gods watching over them, 4 gods total. There is one for healing and creating natural barriers - and one for destroying enemies/fortifications.
The game would be like Survival (That one game), Zombie Master and From Dust.
Opinions?