The teachings on the Course are non-dualistic teachings. If you return into historic China or back into India, you would've heard of Advaita Vedanta. Advaita in fact suggests “not two,” and that's a way of speaking about the fact that there's a oneness which connects us all. Gathering several passages https://www.youtube.com/channel/UCTleG6-484F7WHZD0hAjRRw