There's a bit in Debt (the book I'm contractually obligated to mention in every one of my posts apparently because it's occupying my entire brain rent free) where Graeber describes missionaries trying to introduce the idea of the immortal soul to relatively undisturbed tribal peoples, and what really freaked them out was the idea that there was a body separate from the soul, not that there was a soul. I think that dually, there isn't much point to worrying about the potential immortality of the soul, though it does seem a useful basis for getting people to care long term about the earth and the consequences of their actions, but it is probably a useful way to encapsulate that people's experiences are complex and intricate and there isn't much point in trying to parse them into categorical separates in the manner of Cartesian dualism.