the pope is talking about the here and now — about us living. Catholics and Lutherans of today should not be righting each other. Debating, arguing yes, but not fighting
“If it is you and me, it will be me. If it is Us and Them, then it will be US!”.
In other words we can and do through pies at each other, but we are still on the same side. It took a long time to get past the point of arguing via rifle sights.