User blog:Yourgirlyui/Underworld and Land of the Dead

I guess many of you have also read the Kane chronicles, if not go and read it already! XDD

Ok, now my question:

It was hinted that Greek/Roman Gods and the Egyptian Gods coexist in the same world. I wonder who or what decides where you go after your death: the underworld or the land of the dead?

Any theories on this one?