I don't know Satanus. What I do know is this: anytime your world is seen through the lens of "me" you are living in a dualistic world because that "me", by virture of its very existence, sets itself apart from everything else. Does that automatically make you a Cartesian? I don't really know - would it really matter one way or the other? I only know for certain that when the me is found to be nothing more than a mentally created entity that doesn't exist except as a thought-form there is a shift away from identifying with it. With that shift one consciously returns to the underlying awareness as the reality of one's being - that is the abode of unconditional peace and of wholeness. There is no need to seek peace in some religion because it already exists as your very Being. There is no need to seek wholeness through some philosophy because it already is here as the underlying awareness that is your true nature.
That's when it is seen so clearly how religion and philosophy make it so difficult to wake up to the truth of what you are. To dwell in ideas about the future and regretful thoughts of the past only serve to keep you bound in delusion, oblivious to where life actually is lived, the here and now. People tend not to live fully conscious of now, and instead dream of idealized futures that only hold hope for some kind of "salvation" if prescribed holy traditions and saviors are followed. This keeps one on the treadmill like some gerbil, never really getting anywhere.
While abiding in your real nature, however, thoughts of me and other don't arise, thoughts of "spirit" versus body don't arise - there is just the simple realization that all, just as it is, is "it", and that "you" are that which sees it, you are that in which it all arises. This is the wholeness where ideas of fear and separation evaporate - the "light" of awareness/You allows it all, and because there is nothing that can harm or threaten You there is a deep and unshakeable peace that permeates everything. "I am, therefore I think" is closer to how things actually are..