I own a not insignificant number of copies of Wolf Hall by Hilary Mantel, the best novel ever written in the English language. As a Christian who is saved in Christ (I think?), this fact, and God's eternal love, are the two things I can depend on.
Belief is a slippery thing to write about -- it can feel instructional, when you're really just trying to work things out; or self-congratulatory, when you are actually trying to interrogate what it is you believe. Putting your belief(s) in writing can also feel final: It's in words because now it's true.