"God has used migration for millennia to achieve his purposes for his people," writes Patrick Johnstone. "He is doing so again in our time."Millions are on the move, driven by war, drought, terrorism, poverty, failed states, environmental catastrophes, disease, revolutions, and the desire for a better life. Christians have a unique perspective on the migrant crisis: after all, Jesus was a refugee. So were Abraham, Joseph, and Moses.Today,...