On Jan. 6, 2021, a large group of evangelical Christians attacked the U.S. Capitol on the understanding that they were fighting for God's president. (Not all of those who stormed the Capitol were driven by religious convictions, of course, but a large proportion were.) They were ready to kill for their president, take down a democratic system that has endured nearly 250 years, and follow Donald Trump at God's supposed direction until America became a Christian theocracy. As the House Jan. 6 committee concludes its investigation, I think the power and significance of these evangelical believers have been overlooked. Most...