Job601
Your books are unusual for the fantasy genre in that they are interested in exploring traditional Christian values, usually coming down in their favor (especially faith in providence and the willingness to believe in a divine plan for the world and the individual, something which comes up again and again in your work.) At the same time, your characters have reason to be suspicious of the specific forms of religious practice in their worlds, and the cult of the survivor in particular can be read as a conflicted portrayal of religion: it's a kind of religious belief which works in some way for its faithful despite being based on a falsehood, and Kelsier is a kind of dark parody of Christ. The cosmere seems to have an implicit theology which separates the truly divine, which is fundamentally inaccessible even to the most knowledgeable characters, from the apparently divine shards and splinters. I guess my question is, how do you think about integrating religious themes into a fantasy universe, particularly given your systematic style?
Brandon Sanderson
There are a lot of things mixing here--more, probably, than I'm aware of myself. (This is the sort of area where I let reader analysis and criticism do the work, as they're probably going to be able to notice connections more explicitly than I will. Like most writers, I'm working by instinct much of the time.)
One element I can talk about is the need for the cosmere to have questions that will go unanswered. This is most expressly manifest in the "big" questions. Is there a God? What is the actual afterlife like, if there really is one? Is there such a thing as a soul, and are cognitive shadows the actual person, or a manifestation of the magic imitating a person's thought processes?
The reason I don't answer these as myself (though characters certainly have ideas) is because I feel it important the text not undermine the characters who choose not to believe in these things. Though I think I've found answers in life, people rationally disagree with me--and to express only my worldview in the books would severely hamper my ability to have characters who disagree with me, and other characters.
In short, if I were to say, "Yes, there's an all-powerful God" then it would directly undermine characters like Jasnah, who argue otherwise. At the same time, I want characters like Kelsier to develop naturally, and do things that are in line with how sometimes, religions develop on our world, without having it be a statement. (Or, at least one other than, "Hey, this happens some time on our world. It happened here too.")
Fantasy offers some unique opportunities to explore the human condition with religion, and I want to take advantage of that, to see where it takes me and to see what I can learn from the process.