Sorry to keep pestering you David! Have you defined any creation myths from the various cultures/religions?
Yes! Every religion has a "Myths and Legends" section near the top of the page which describes the origin myths believed by the church's priests and faithful.
I have not created creation myths for all the cultures. Most of the civilized kingdoms have organized religion (and it's all in the respective religion pages). Some of the more primitive cultures probably have interesting creation myths, but I haven't detailed them out yet.