In my post “Worldview—3 Choices” I’d described a simple way to understand the basic worldviews (natural, supernatural, mystical). To discuss this and related subjects with your small group, I’m providing a handout that you can print and use.
As Christians are tempted by elements of other religions and try to merge those into Christianity, it’s important to grasp that there can’t be such a thing as, for example, Christian Zen. Christianity is based on the supernatural worldview; Zen is based on the mystical worldview. Also see my post “Christian Whatever?”