:shrug: It's a modern magic form, so I suppose it depends of your definition of pagan and witchcraft but that's besides the point, the point is there's at least one belief system that involves switching belief systems.
"Some common sources of inspiration include such diverse areas as science fiction, scientific theories, traditional ceremonial magic, neoshamanism, Eastern philosophy, world religions, and individual experimentation. Despite tremendous individual variation, chaos magicians (sometimes called "chaotes"[2]) often work with chaotic and humorous paradigms, such as the worship of Hundun from Taoism or Eris from Discordianism, and it is common for chaotes to believe in whatever god suits their current paradigm and discard it when necessary."
Chaos magic - Wikipedia, the free encyclopedia