One thing that most fantasy writers don't really put enough emphasis on is the importance of religion. This is largely understandable, since we now live in very secular times, and most fantasy writers are not particularly religious. However, in every pre-modern society religion is hugely important. Religious wars are the bloodiest and longest lasting before the 20th century. So I'm going to talk about the religion of the little world I've been creating (I need to give this world a name, but I often put that off, it's not my greatest skill). Since we are focused on the West, I think that there should be a strong centrally organized religion. It's tenants are strongly tied up with the old magic, and the traditional ideology that it is allied with. Much like the medieval Catholic Church, the church of this world will have temporal power in addition to it's spiritual power, and be quite corrupt. To come up with some specifics I will name the church the Anogrian, after it's chief prophet Anogre (pronounced ann-ogh). It once directly ruled the Anogrian Empire, but now only has some small lands under it's direct rule. It still holds vast powers, and is the main religion of the West.
The followers of the new magics are mostly secular, though rarely atheist. They tend to believe in rationalized versions of the Anogrian religion, much like most people do today, and intellectuals did in the enlightenment (replacing the Anogrian religion with Christianity, obviously.)