If you don't like how athiests are treated, then don't be one, in RL i am an athiest, however in game, im all for Xiosia. from my point of view, in-game what you want to call religion, i call point of view, its a point of perspective, since it is proven that all the gods exist, when you select a 'religion' you are actually choosing who you want to worship, if you pick athiest i simply believe that just means you dont want to worship anyone.