As someone who was deeply involved in New Age and metaphysical practices, I can tell you from experience: There is a spiritual realm in this world. There are spiritual battles being fought. And there are frightening things from which we need to run--even if, like that Ouija board, they look benign on the surface.
Holly Vicente Robaina at Christianity Today, writing about the spiritual threats of yoga to Christians.
You know, if you're a conservative Christian in the United states in the early 21st century, the outside world must be terrifying.