ShadowAngel159 wrote: Nurgle just uses his to spread more diseases.
It could also be said that god, whom ever he/she/it is does similar things, like just using its followers to spread what ever, be it love or intolerance of other people's thoughts and belief's similar to what your intolerance of people comparing one fictional god to another who may or may not be fictional.
As for the eight pointed star, I'm gonna have to go ahead and say that
GW just took it for use. Not sure about Khorne though, I don't think I've ever seen a similar thing in judeo-christian things.