The Church teaches that if we are in a state of mortal (serious) sin, then we risk losing our souls. This makes perfect sense. I dare say that practically all of the nations in the world are in the state of mortal sin ~ look at the suicide bombings, killing of innocent civilians, genocides, assassination of political enemies, legalization of abortion, and many others. The nations are definitely risking losing their souls. Only repentance and returning to God can save them. Since only believers pray to God, they bear the responsibility of praying for the world. Therefore, pray hard to the Lord for his mercy.