According to a recent CNN/ORC poll, many white evangelical Christians in the early primary states support Donald Trump. That’s surprising. Trump’s call Monday to bar all Muslims from entering the U.S. is perhaps the biggest act of religious bigotry in modern presidential politics. Such a proposal is a total affront to the gospel of Jesus Christ. It’s stunning that Trump would ask the American people to punish Muslim refugee families for the sins of ISIS. It’s even more stunning that such positions have traction with the American electorate. As we come upon Christmas, the business mogul turned presidential candidate has...