The Temple believes in reason, empathy, and the pursuit of knowledge, its website FAQ helpfully explains. And it doesn’t worship Satan. “Satan is a symbol of the Eternal Rebel in opposition to arbitrary authority,” it states. But it’s not just a joke, supporters say. And opponents seem to agree. One man was charged in January with a hate crime for vandalizing the temple’s altar at the Iowa State Capitol. Another was arrested and accused of throwing a pipe bomb at the group’s headquarters in...