Well it is a subject that has only briefly been touched upon. I am reluctant to have too many gods for the sake of over complicating the story. Having two or three gods is hard enough.
Regarding war gods... I am unsure how this would be taken on the believability scale... But I kind of feel that the concept of warfare and conflict might not be a god. Fortunately. War is not a fundemental constant force but a human state of affairs. Therefore the personification of war would be a transient 'god' that does not exist in times of peace- and is only a reflection of human affairs, not an instigator.
Due to the issues caused by the sun wars are on hold I suspect. (mostly). Resources have suddenly become more plentiful with everyone occupying unique niches to the environment...
Basicly war has very little power now. In my opinion.