In ACIM circles a lot of said with regards to "the separation", and usually always in terms of the separation from God. Some kind of giant distancing which occurred a long time ago and is so vague and nebulous that no-one is aware of it.
What is less obvious though is that the separation also took place between members of the sonship. Individual brothers experienced separation between them, which became a kind of competition and war.
This separation now in fact plays out in ALL relationships on earth. Every way that you are considered separated off from others, are not them, are not joined with them, do not share with them, IS the separation playing out.
Jesus also remarks how when the ego uses projection to try to project blame/sin, it is trying to perpetuate the separation. This is because anything that increases the rift between you and your brothers IS increasing the separation.
It might not have seemed so obvious but the separation from God IS playing out between you and other people right now. It's not distant and vague or happening in the distant past. It's right in front of your nose right now.
The way that you consider yourself to be identified with your body, is one way that you separate off from others. The body is used as a kind of anchor to keep you away from other people. Only when it is used to allow you BYPASS the body and join with the minds of others, is it being used for a holy purpose.
So yes there was separation (belief in) between you and God, but this also affected all your relationships, including those with your brothers, AND also with your own creations. Your direct immediate way of relating to ANYONE testifies to whether or not you are still perpetuating the separation or are healing it.
This is why our brothers are so important or are considered part of our salvation. It is REQUIRED that we rejoin with others in order to undo the separation. There is no way to leave them out of it. We have to learn how to share again, which can only happen by transcending physical boundaries.
"The Atonement is a lesson in sharing, which is given you because YOU HAVE FORGOTTEN HOW TO DO IT. The Holy Spirit merely reminds you of what is your NATURAL ability."
"The miracle is an expression of an inner awareness of Christ and acceptance of his Atonement. The mind is then in a state of Grace, and naturally becomes gracious, both to the Host within and the stranger without. By bringing in the stranger, he becomes your brother."
"Forget not, when you feel the need arise to be defensive about ANYTHING, you have identified YOUR SELF with an illusion. And therefore feel that you are weak, BECAUSE YOU ARE ALONE. This is the cost of ALL illusions. Not one but rests on the belief that you are separate. Not one that does not SEEM to stand, heavy and solid and unmovable, between you and your brother. "
"How EASY is it to offer this miracle to everyone! No-one who has received it for himself COULD find it difficult. For, BY receiving it, he learned it was not given him alone. Such is the function of a holy relationship; to RECEIVE together, and give as you received. Standing BEFORE the veil, it still seems difficult. But hold out your JOINED hands and touch this heavy-seeming block, and you will learn how easily your fingers slip through its nothingness. It is no solid wall. And only an illusion stands between you and the holy Self you share."