"Reject Christian Nationalism. Keep religion out of government." That's what the billboard near the State Capitol reads — in all caps. In smaller type is the name of the group that paid for it: Humanists MN. The sign has been getting plenty of attention. No matter your take on the First Amendment and its clauses, however, the billboard likely prompts a question: What's a humanist? That's something Ellie Haylund, president of Humanists MN, finds herself answering often, even though her organization calls themselves the state's largest group of nonbelievers. "So many people have not heard of it," Haylund said of humanism. "But as soon as you describe it, most people I know, say, 'Oh, that's me, I didn't know there was that name for it.'" Humanists don't believe in a god. Instead, they unite around shared ethics and values — such as compassion, critical thinking, civic engagement and sustainability — and come together for service projects and community gatherings. The American Humanis...