There is only one curriculum. It is God's curriculum. It applies to EVERYONE, no matter how awake or asleep or in what walk or life or following what religion, even people who have never heard of A Course in Miracles. There is a difference between ACIM - the book, the course - and "the universal curriculum", which applies to everyone, book or not.
The curriculum is REQUIRED, in that there is only ONE truth, and every single soul has to find their way TO that one truth eventually. The truth is non-negotiable. "The time you take it is voluntary", and you can go closer and retreat and get lost and come back again etc but generally speaking "the truth" is the curriculum that you need to learn, ie the atonement, and either you learn it or you avoid it for a while, but *everyone* HAS to learn it. Because it's God's guarantee that you WILL wake up from dreaming.
God's ANSWER to the separation, which includes ALL PEOPLE, is the Holy Spirit, who he created AS the answer. Not just a bunch of information. Not just some "optional path". He is IN YOUR MIND as a spirit being, and he forms the Christ Mind, which ALL souls share. It is *IMPOSSIBLE* to be awakened and to exclude the Holy Spirit. The truth that you learn, true perception, IS HIS perception. You can only "learn it", by joining YOUR perception with HIS and aligning with His way of seeing. There is NO OTHER way, other than the ego's.
So essentially the Holy Spirit, sooner or later, is going to form a relationship with you, you are going to develop trust, you're going to open up to Him and work with Him. He is your TEACHER. Jesus also calls him "the only therapist", due to His position of knowing the truth. There is only one truth no matter who you are.
This applies to all Christians, Jews, Muslims, Catholics, Buddhists, Hindu folk, you name it. The Holy Spirit is *unavoidable* in the curriculum process. Indeed Jesus says that you must learn to join your mind with His and SHARE His mind. You cannot avoid Jesus either. And that's probably something that might piss off some people following the FORM of other paths. That is why Jesus CORRECTLY and truthfully said, "I am the way the truth and the light and no one comes to the father but by me."
Additionally, though some will not like this fact either, being a miracle worker is a God-given right and *completely natural* for anyone who is joining with the Holy Spirit's thought system and waking up to the truth. Removal of blocks to awareness releases or rather stops interfering with miracles, and "miracle working" becomes your natural profession. As Jesus says also, once you accept the atonement you become PART OF the atonement plan and then you PROFESS HIM... ie express Him, because "atonement is the natural profession of the children of God." And that applies to ALL SOULS, no matter how ACIM-oriented you seem to be right now.
The fact is that as you approach the truth and merge with love etc, you WILL, MUST, CANNOT AVOID, becoming miraculous. It is your nature. God created you miraculously and you are miraculous forever. And so you WILL perform miracles as part of your function of healing on Earth. Anyone who "doesn't like" the idea of performing miracles FOR OTHERS (professing Jesus) is going to run into a roadblock at some point because miracles are NATURAL and *EVERYONE* is supposed to be doing them.
So long story short, the curriculum is not optional, nor is becoming intimate with Holy Spirit, nor is having a direct relationship with Jesus, nor is miracle working. This is why Jesus also says you MUST join the great crusade with Him as an active worker. It's not even something you would want NOT to do. It's a given. Part of the metaphysics. You become part of the atonement PLAN which goes far beyond yourself and helps others.
So all this stuff IS MANDATORY. You can, however, avoid it. You can be in denial of it. You can try to reject it. You can refuse to accept it. But it does not change the facts or the truth. At some point, everyone is going to return to God through the universal curriculum. They MIGHT not necessarily do it through the FORMAT of "A Course in Miracles", the book, with the lessons etc... they MIGHT come to it through what SEEM like "other paths", but no matter the appearance of the path, it is ALL part of God's curriculum for awakening, which MUST include the Holy Spirit, joining with ALL brothers including Jesus, and taking lessons to learn the SAME truth as everyone.