The teachings in the Course are non-dualistic teachings. Should you go back into historic China or again into India, you would've heard about Advaita Vedanta. Advaita actually implies “not two,” and that is a method of talking about the fact that there's a oneness which connects us all. For me https://www.youtube.com/channel/UCTleG6-484F7WHZD0hAjRRw