The only thing that we need to really do is to surrender to the will of God. To accept it. To accept the truth. This is the same thing as accepting the atonement.
Here's the fact of it all.
God's will is the truth. You can try to deny it, but you cannot change it.
You have immortality and perfection already because God created you immortal and perfect. This is why you need do nothing. You are already complete. You already have eternal life. There is nothing left to do. You cannot add anything to this or take anything away.
So anything else you are doing, any other attitude you have, it's really a form of DENIAL. Denial is the opposite of acceptance. Either you are willing to put aside and drop and let go of EVERY STORY that you've built to defend against the truth (which has made you sick), or you will continue to have fake experiences of suffering.
You can't change God's will. God has not changed his mind about you. It's rock solid, set in stone forever. More permanent than sin. More unchangeable than death.
So..... what is it we are doing? We're saying, oh, I'm not worthy of love, or... I've got some "reason" why I am not the way God created me... or, something's wrong with me, or I want things to be different to God's creation, or I don't want God's love I want something else, or... I think I can make something better, or I prefer my dream of death, or whatever... all these other "alternatives" which pretend to be desirable, wanted, chosen, possible, plausible, a replacement for the only truth.
All of it is false, all of it is a lie, all of it is denial and none of it works.
Only the truth is true. Only God's truth is true. There is absolutely ZERO room for negotiation. God's will cannot be opposed. You cannot create an alternative to heaven. There is nothing you want more than to share God. Nothing else can make you happier. There is no other source of love or life.
What are you going to do? Keep trying to find salvation somewhere else? Keep trying to accept something less satisfying? Keep looking for love in all the places that it does not exist?
At some point we have to simply SURRENDER and GIVE UP this futile search and ACCEPT that, all along, God's Will has been the only will.
This is what the prodigal son story is about.... finally surrendering and ADMITTING YOU ARE MISTAKEN and then giving up your futile attempts ... returning to God and ALLOWING HIM to be as He is. To be your truth. To let go of every other authority problem.
To those who say the course is not about surrender, because it never mentions surrender.... it is ENTIRELY about surrender. Letting go of the ego, giving up the fight, accepting the truth. It's all surrendering of what is not true, and accepting what is.
Can you just be honest and admit the truth that God does love you and you are loved and you are immortal already?