To the ego, its key difference in atonement is that something really DID happen. It then has a form of atonement which involves attempting to make up for what you did, to pay for it. That typically means being guilty for a long time and suffering sufficient punishment and sacrifice.
But there's a problem with that, because no amount of punishment will actually undo the sin. If you're holding out for a pardon or are pleading for forgiveness, good luck. It won't happen. The ego knows this because it has no real intention of ever forgetting that the sin happened. Which means, there really IS no way that you will ever make up for it. Everyone believing in sin will condemn you forever and no-one is going to forgive you on your behalf.
One single little tiny sin to the ego is justification for you to die a horrible death. Make no mistake, it has its eyes fixated on that simply because it is logical. If you DID do something wrong, then you DO deserve everlasting damnation. Because if what you did was REAL, then it cannot be undone. What is real simply is real, and nobody can change it.
This is why the ego creates this scenario where you "really do stuff" in the world, then that stuff gets quickly locked into the past where it cannot be changed, the consequences of it seem real and prove that you did it, and then there is literally no escape. So then you will fear punishment in the future. And that fear of punishment will never go away so long as you still agree that you really did sin.
The ego isn't going to find it in the bottom of its heart to forgive you and let you off the hook, lest it be for a devious purpose of making sure to eventually strike you down at some later date, reminding you of what you did all over again. It has no intention of forgiving you ever. It's idea of atonement is never-ending punishment, and forever in hell is not long enough.
In this world, no matter what you do, it is a sin, and you are automatically guilty until you die. Every time you breathe, every time you move, everything you say, every action and every consequence, is sin taking place. Stuff happening and pretending to be real. Every second of every day condemns you to death, even if nobody points it out. The ego knows what you did and it will not forgive you.
This is the kind of atonement which does not work, you cannot accept it, it cannot bring you freedom or peace, and it will just keep guilt and sin intact. This all hinges around keeping the sin real and believing that it really happened. Everything that comes from that, all of the so-called atonement, is nothing but a fake promise to make you suffer unnecessarily with absolutely no change in its death sentence. Once condemned, always condemned.
There is another atonement which works and which is freely available and which you have access to at any time you want it. This other atonement can set you free of not only the need for punishment or compensation, but can literally cancel out any need whatsoever for you to be punished. This other atonement has the capability of actually finding you innocent, and not after any amount of time at all. The innocence on offer is permanent AND immediate, and there is nothing keeping you from it.
A process of undoing perceptual errors and false beliefs should and must lead your mind to the atonement. It lies on the other side of believing that sin is real. First you must undo all belief that fear or guilt is called for, and then realize also that sin is not the truth either. Whatever you did, you did not do it in reality, and therefore it was not a "real sin". It was a make-believe sin, because there is no such thing as real sin.
This the ego does not want you to know - that you actually cannot sin at all. It's entire story hinges around you believing that your sin was done in, and to, reality, having real effects on something real, effects which are irreversible and unforgivable. Effects which prove and demonstrate that your innocence is destroyed and you will forever be damned to hell. None of that is possible if your innocence is intact, and to be intact it must mean that whatever you think you did, you did not really do.
So this all depends on your willingness to entertain the idea, that sin is not REAL. That whatever happened, wherever it happened, and no matter how it appeared, or what the seeming consequences appear to be, all of that is within an IMAGINARY DREAM. The dream may well seem real, but it is your task to question that *assumption*, because it is entirely based on believing illusions. None of those illusions are reality and there actually is no real proof of real sin.
Anywhere that sin can really seem to take place cannot be real. That is why the world is not real. In reality, real sin cannot happen, because innocence is permanent. So wherever innocence is, that is real, and it is in that place that nothing real can be threatened and nothing unreal exists. To believe that your sins are not REAL, and therefore are forgiven, is to recognize that a world made of sin and which demonstrates sin is also not real.
You have not sinned because the separation from God cannot happen, really, and what appears to be separation from God - a physical universe - is not reality.
You have not REALLY done what you think you've done, and it has NOT, absolutely HAS NOT, had any effect whatsoever on REALITY. It has not hurt God, it has not offended God, it has not made God hate you, it has not changed God's mind about you, and it has not really done anything at all that's actually real. The so-called consequences are all imaginary and happening only in an unreal dream. Regardless of their apparent severity. There is nothing that you can do in this dream that cannot be forgiven.
So sin is not real. That automatically means separation hasn't happened, because sin is the idea that it has happened. If separation has not happened and you have not really sinned, then....... ...... you must still be innocent, right? God must still recognize you as innocent. You must have not sinned at all. You cannot have stopped being innocent because you did not really sin. So your innocence is still intact and THAT means, you are still WORTHY of God's love.
Your own ability to see, agree with, claim, and accept that this is TRUE of you, depends entirely on your willingness to stop believing that you have really sinned. Only then can you yourself allow and accept the truth, that your innocence is guaranteed, your worthiness has not been defiled, and you STILL are forgiven because you have not done anything really wrong. Only when you can accept that will you be able to genuinely admit and accept the truth of the atonement.
Nothing really happened! It was just a dream.
In the acceptance of this atonement, your sins are recognized as NOT being real sins, and in that view your sins are forgiven. This is what true forgiveness means. This is the state of a forgiving mind, shared with Holy Spirit, in which you do not see anything needing to be forgiven because there is no real sin. You BECOME forgiving when you enter this state at the END of your "forgiveness process" or process of undoing or purification.
THEN..... once you have accepted the atonement, it means you have accepted that God loves you, you are worthy of love, you are WILLING to receive love, you will ALLOW love, and you will BELIEVE that love is justified. You will believe that you can be loved, are loved, and can love yourself. THEN, because you are willing to admit to your own lovability, you WILL also admit to the lovability of your brother. You will overlook and forgive them just as you have yourself and now MIRACLES WILL BE JUSTIFIED.
You are now in a position to express love, having received it and accepted it, and having gotten rid of the blocks which were stopping it from expressing. And love will flow through you and be shared with others. And love is powerful. It has within it the power to HEAL and enlighten. It knows no limits and has no boundaries. There is nothing your holiness cannot do. Expressing this love then becomes second-nature, and working miracles is now the "right" that you have claimed entitlement to. Miracles will flow naturally because of your willingness to truly express love, having loved yourself.
Accepting atonement for yourself is your sole responsibility, SO THAT you can reconnect with God and start to SHARE love with your brother. It means the same thing as undoing false perceptions so that your own mind can become willing to be a conduit for love, SO THAT love can then flow through you and extend outward, which will be seen as miraculous in its effects. Illusions will not limit this love and sickness will have no power to stop its healing power. You have taken up your position as a Teacher of God and are now a miracle worker.