This is a good question. It is commonly understood that different denominations exist because of different beliefs, but in fact I think the asker alludes to something more accurate: each denomination doesn't merely have a different set of belief, but a different emphasis on which epistemological area is of greatest importance. I think there is merit in this idea.
The evidence is disappearing with time as more denominations have embrace the idea that faith in Christ, as evidenced by a Christ-centered life, is the most important area of belief (enough that for many and ever more pastors differences in other areas of belief are relatively of little consequence).
So if you want to look at different epistemological preferences (as opposed to different beliefs) I think you have to go back and look at the origin of each denomination. When Martin Luther nailed the 95 theses to the door of his local church the main contention was that men didn't need other "God-ordained" men to be saved. From that "saved by Grace lest any man boast" became their clarion call. This belief was adopted by most Protestants but with each reformation into another faith you will find there was in general an emphasis on a certain doctrine above all others with which they contended most fervently.