Horror Apocalypse story!~?

alright well I am horrible at making up storyline for characters..... all I know so far is that this is a world where the undead and demons are trying to take over.... I figured I would play an Evangelical Priest kinda like Father Anderson from Hellsing.... but I need a kick-*** story background... I get bonus points to create my character if I have a background..... whoever writes me a good background gets Rated Awesomely!~