Muse is actually a Christian band I think, though it is not their only subject matter per-say, but if you listen to songs like New Born, I believe it is supposed to be Born Again; but they do a really good job of hiding it sort of. Mart Bellamy even said that the person he'd most like to meet living or dead is Jesus Christ. A lot of their skngs are about fears, avoiding worst case possible future scenarios, out of control technological progression, things like that.
Baby Metal is a Christian band, but again they don't seem like it by conventional standards, they are dark gothic. A lot of Christians like stuff like that now, but are kind of non-denominational I guess.
I've dark gothic things, I am not a bad person. Self expression is complicated and abstract, subjective.
White Stripes might be a Christian band a bit as well, he has covers like "John the revelator"
Nine lashes is a band I like.