Name the faith and you can find a dozen variants of it, all claiming to be the one true way.
For example:
http://en.wikipedia.org/wiki/Jewish_religious_movements list quiet few different sects that all see themselves as the correct one.
If you look at Christianity there are literally thousands of sects out there - all with different beliefs about what "the White God" (as Mab names him) wants.
Looking at other literacy examples, Jim Butcher mentions that he reads Simon R Green, and Simon R Green recently had a book where the Walking Man (the wrath of God among men) arrived in the Nightside, bringing death to the wicked. He's called the Walking Man because when he comes for you he walks in a straight line - nothing can stop him and he can kill practically anything while nothing can harm him. When various targets talk about repenting and God's forgiveness, the Walking Man calmly says "Not my department" and kills them. When other representatives of God try to talk to him the Walking Man basically ignores them - because they aren't his department. Narrow vision and armed with the Wrath of God - that's interesting take on a soldier of God. I'm thinking maybe Morgan as a Knight of the Cross.
Or to put things another way - we are a group of gamers posting on a board that frowns on "touchy topics". We are not theologians. We are not going be able to determine the "real" agenda of God as presented in the Dresden Files. Not in a way that we all agree on. Not in a way that everyone who follows Him would agree on. Not now and not ever.
I can't even point out areas where faiths disagree without touching on topics that have no place on this board - but I'll give one example of a sect that's trying to make up its mind on a topic. The Episcopal Church / Church of England / Anglican Communion (which is all one group under different names) is currently debating same-sex marriages along with openly gay clergy and bishops. They've been debating it since at least 1998 and since parts of the group are moving in different directions they are tearing themselves apart. They are led by theologians and they dive head first into touchy topics, and they can't make a call on that one issue. They can't even seem to come up with a compromise that is more than "let's agree to keep talking".
If they can't come up with an answer to that one, small issue, then we can't come up with the broad goals of how God is portrayed in the Dresden Files. I mean, he has a black ops archangel and holy warriors who kill monsters, warlocks, and other "evil" people - name a sect whose vision of God encompass all that.
What's left? The group in question deciding if someone is playing in character for what the group thinks is the message is supposed to be.
Richard