War in the Heavens, early days, help needed

Hey all, I am currently working on a space opera(esque) game. The basic concept I have is it is about holy war(s?) in space. The game, or at least this part of it, combines the best aspects of Star Gate and Dune(in my mind the best parts). I am using a Fate inspired mechanic(though it is not(currently) exactly the same(if you want to see my basic concepts check out the my Design Journal). I have two issues so far. The first is that I am still struggling with focusing on the players characters, and not on the world. Basically, what do the players do, what is the game about? Secondly, I would like to flavor the game text in a way that makes the players think about what the characters believe. As this is a game about a holy war I would like the beliefs of the characters to be at the forefront. So I am aiming to design the language of the game to emphasize the belief and religious aspects of the game. As i am quite stuck at the moment, any advice would be welcome. Thank you much!

so for your players' character's religious views it would help to have some of the sides to your holy war outlined i'm at work so i cant go to your journal right now... but then figure out what the players will be side A, side B or some independants in between maybe if its in the middle of the war your players are people smugglers like the freedom railroads for the Jews in WWII in which case they could belong to side A but be side B sympathizers not so zealous as to want to eradicate them all .... maybe the gods walk the stars and its 2 deities swinging there respective planets and races in a giant holy war clashing into each other ??? i like the independent radical ship it gives you 2 sides of Resistance and thus more plot hooks especially if its a mixed crew ... but ya we need as players to know the options for there religions to get behind them as characters if there directly on one side or the other