How do you disagree like a Christian?

As a society, we’re really bad at disagreeing with one another. Actually, that’s not true. We’re great at disagreeing with one another. We’re awful—abysmal—at doing so constructively. Rarely do we engage in civil discourse around different view points, policies, and, yes, agendas. Instead, we opt for defamation, as we see so often on Twitter and cable news.

I wish I could say that Christians were standing above the fray in this. But we aren’t. If anything, we’re even worse. No matter where we...