The Church of Carl
One or two centuries after the Zombie Apocalypse, The Church of Carl will be the predominant religion in the Walking Dead universe. His epistles will be the Holy Book of the Carlist religion and children will be taught about the Miracle of Carl, when His Holy Words brought an end to war and everlasting peace between mortal enemies.
Seriously now, the writers went way overboard with the Carl worship. Everyone kept talking about what Carl would have wanted. Negan gets all teary-eyed at the mention of Carl, drops his guard and allows Rick to slash his throat. Rick, who just one or two days earlier had ruthlessly killed a dozen Saviours after promising not to, now spares his mortal enemy, the man he had sworn to kill, the man whom his longtime friend Maggie wants dead above anything else. If that is not a miracle, I don't know what is!