The simplest way I put it to witchy friends: chaos magick is magick with the religion scraped off. Harsh, maybe. But that’s from the founders. They wanted to strip away the bloated symbolism and get to what actually works. Your changing understanding is perfect for chaos magick. Belief is fluid. Peter Carroll suggested rolling dice for random paradigms: paganism one week, monotheism next, atheism after. It’s about deconditioning.
Sigil magick is a big part of Chaos magick. That is where I would point them, because it will fit more into magick as they understand it.