Jurgen Moltmann calls the rise of national a setback for humanity.
Of course he has personal experience growing up under the Nazis. An excerpt:
He challenged Christians to reject nationalistic ideas.
"The church of Christ is present in all the people on earth and cannot become 'a national religion'," he said.
"The church of Christ ecumenically embraces the whole inhabited earth. She is not a tribal religion, nor a Western religion, nor a white religion, but the church of all humanity."
He added: "The church of Christ is not national, but it is a church of all the nations and humanity."