There are two distinct aspects to creation. One is God's own Self which is complete, the other is God's creation or the exending/projecting outward of God. This extension is referred to as Christ or the Sonship or Kingdom.
Now, we're told that it is the Son who is dreaming, not God. We're also told that God does not believe in or acknowledge the dream, otherwise God would have become insane and there'd be no God to go back to. How is this possible?
Technically speaking, if everything is one and there is only God, then God is responsible for the dreaming of the cocacola delivery truck which just drove past my window. And he is responsible for babies seeming to die. And he's responsible for war. Can God conceive of war, even in a dream?
There's a bit of a problem there, because the course says "never was love in the world", ie, God did not "enter into" the dream. Jesus is also quite clear that while the dream never truly happened in terms of reality, the IDEA of it happening did happen. Can God have an idea of being separate? Is he even capable of that? What would happen if he were capable of that? Who is going to get God OUT of the dreaming state and wake Him up, if God Himself is asleep?
This is why God created the Holy Spirit to "do his dirty work" so to speak. To awaken His son from sleep, cooperatively.
What this all boils down to is this. If God is not part of the dream or dreaming, there ABSOLUTELY MUST be some kind of "distinction" or "separation" between what is God and what is the Son. The Son's mistaken use of will does not affect the father. The son can't cause the father. So that means the Son effectively has free will. COMPLETELY FREE will. It means if the Son chooses to try to will against God, although it in truth impossible, He can still imagine it happening, without God's "approval" so to speak.
Jesus describes mind (of souls) as having two potential functions. One is creation - which uses mind as a medium to Create along the same lines as God, AND He uses the term "co-create" several times. The other is the POTENTIAL of mind to PROJECT, which means it actually has the freedom to ELECT whether or not it will will with God or not. He even says that the fallen angels are "free to establish their kingdom wherever they choose". ie God isn't going to force them to comply with His will anytime soon.
This is ALSO why, the curriculum is mandatory and REQUIRED, BUT... you can elect WHEN to take it. You can postpone it, ignore it, choose away from it, and decide not to learn it right now. How is that possible, if God's will is somehow forcing you to act a certain way or make certain choices? And how is it possible that "love does not enter where it is not welcome", meaning that if YOU elect to do so, you are able to make love not welcome?
Basically, long story short, God does not WILL that there be death, God does not will suffering, God does not will war or conflict, God does not even will any kind of dream. In fact God wills that you WAKE UP from dreaming, and that's why He created the Holy Spirit to facilitate that. And this is why you also have to give your WILLINGNESS - your little willingness - in order to CO-OPERATE with God's Will for you.
There absolutely definitely IS a distinction between the freedom of God's will, and the freedom of your own will. Will does not coerce or force you. While you are an effect of God, you are not his slave. You are not created to "have to" do anything you do not choose to do.
The ONLY WAY that God cannot be the one who dreams, is by having given you ABSOLUTELY TOTALLY FREE WILL. As in... practically the same thing as saying you are SEPARATE. Absolute complete freedom. If you did not have absolute total autonomous freedom to decide for yourself, dreaming would be impossible and if dreaming were happening God would die.
This is why A Course in Miracles is not well represented by thinking of it as a teaching of conceptual "oneness" ie singularity, or as a teaching of "non-duality". Non-duality completely ignores the FREEDOM with which God creates, and the total freedom He GIVES to his creations. As the course says itself
"How wonderful it is to do your will! For that IS freedom. There is nothing else that ever should be called by freedom’s name. Unless you do your will, you are not free. And would God leave His Son without what he has chosen for himself? God but ensured that you would never lose your will, when He gave you His perfect Answer."
"The mind can be right or wrong, depending on the voice to which it listens. "
"Souls were given their own true authorship, and men preferred to remain anonymous when they chose to separate themselves FROM their Author."
"Peace is a natural heritage of the Soul. Everyone is free to refuse to accept his inheritance, but he is NOT free to establish what his inheritance IS."
"God, who encompasses ALL Being, nevertheless created separate beings who have everything individually, but who want to share it to increase their joy. Nothing that is real can be increased EXCEPT by sharing it. That is why God Himself created you. Divine Abstraction takes joy in application, and that is what creation MEANS."