Atonement
Castiel prays.
“Father, forgive me.”
Not all angels pray. Prayer is the human way to talk to God. Angels aren’t human. They’re beyond human, divine, but not quite as pure as God, their father. They don’t need prayer to speak to him. Because many angels see humans as weaker, in need of protection and guidance, that taking on their mannerisms is seen as accepting a weakness. Angels don’t have weaknesses. Angels don’t have doubts either.
“I don’t believe killing all those people would have been right.”
That’s why he prays. He doubts some of the things he’s ordered to do. Though he follows those orders, he would never dream of disobeying his father, Castiel sometimes doubts what he does is good. He feels deep down that his purpose as a soldier is to protect. Some of the things he has done in the name of God don’t protect humans, it kills them. Those deaths weigh heavily on him.
“We’re supposed to save them. How does killing them save them?”
He loves his father’s creations. Humans are wondrous things, great works of art. He doesn’t view them as weak. Humans are stronger than angels give them credit for. They live in a world where they don’t know God exists. They live surrounded by evil and sin, tempted every day of their lives to give up their souls to Lucifer and his demons. Their faith, though the world now has very little, is simply amazing to behold.
“I know we have to hold the line. Lucifer cannot rise, but… how many am I going to have to kill to hold the line? How am I capable of slaughtering those I am supposed to protect?”
God knows all of his doubts and questions. Castiel doesn’t have to pray to God for Him to know. God has known since the first question appeared in his mind. God forgives him and that’s why Castiel prays. He needs His father’s forgiveness. Angels shouldn’t have weaknesses. Angels shouldn’t have doubts.