But emotional sobriety? That deep inner peace, freedom from resentment, fear, and ego? I don’t think it’s achievable without surrendering to an Almighty God.
You're certainly entitled to your opinion. To be sure, it's clear to me that reason supports the existence of God, but I've known more than one atheist who shows many (if not all) of the external signs of being blessed with God's peace: love, joy, patience, kindness, gentleness, self-control... heck, there are days when they do a much better job of it than I do. Since God seems to be blessing them with the fruits of his spirit, who am I to say that he's not pleased with their efforts to allow the Steps and Traditions to work in their lives? It's a spiritual program, right? And all spiritual progress is due to the grace of God, right? And Jesus said "I have other sheep who are not of this flock", right?
I like the way C. S. Lewis said it in Chapter 15 of The Last Battle. In it, Emeth tells of his meeting with Aslan:
Then I fell at his feet and thought, Surely this is the hour of death, for the Lion (who is worthy of all honor) will know that I have served Tash all my days and not him. Nevertheless, it is better to see the Lion and die than to be Tisroc of the world and live and not to have seen him. But the Glorious One bent down his golden head and touched my forehead with his tongue and said, "Son, thou art welcome." But I said, "Alas, Lord, I am no son of thine but the servant of Tash." He answered, "Child, all the service thou hast done to Tash, I account as service done to me." Then by reason of my great desire for wisdom and understanding, I overcame my fear and questioned the Glorious One and said "Lord, is it then true, as the Ape said, that thou and Tash are one"" The Lion growled so that the earth shook (but his wrath was not against me) and said, "It is false. Not because he and I are one, but because we are opposites - I take to me the services which thou hast done to him. For he and I are of such different kinds that no service which is vile can be done to me, and none which is not vile can be done to him. Therefore, if any man swear by Tash and keep his oath for the oath's sake, it is by me that he has truly sworn, though he know it not, and it is I who reward him. And if any man do cruelty in my name, then, though he says the name Aslan, it is Tash whom he serves and by Tash his deed is accepted. Dost thou understand, Child?" I said "Lord, thou knowest how much I understand." But I said also (for the truth constrained me), "Yet I have been seeking Tash all my days." "Beloved," said the Glorious One, "unless thy desire had been for me thou wouldst not have sought so long and so truly. For all find what they truly seek."