this is so true, ones idea of god is ones own perception of god within ones self.

to communicate this god we have to use language, but language opens up to the variables of perception and emotional weight.

so the person we are trying to communicate the idea's too, only ever stands on the brink of grasping how we truly understand or percieve the idea of god as it is something which truly resides withing the 'i' of a person.

so religon in the mass effect (que gamer pun) can be viewed in many lights.

firstly, the easiest. answers for the small minded.
secondly, control of society and individuals.
thirdly, a moral framework
fourthy, an identification of acknowledging god.
fithly, a networking tool for people that understand god.

so really it is what you make it.