First of all, Descartes was a faithful Catholic. I do think that some of Descrates’ philosophical views are problemmatic, but that doesn’t make him the father of secular materialism and denigration of the body and so forth. Poor old Descartes, getting the blame for the evils of modernity as if he was modernity’s founding father. If you wanted to look for a cause of secular materialism and determinism, it would be better to look to Thomas Hobbes. Even so, I am skeptical of arguments that try to trace the evils of modern thought back to one thinker. I’ve even read works suggesting that Aquinas is the root cause of modern atheism and existentialism (I’m not joking).
But, I would say that Descartes view, while technically not heretical, does tend to reduce the body to being the status of a machine. As far as the body liberating the soul? Perhaps our pre-fallen body liberated the soul, but not the post-fall body. The post-fall body is racked with concupiscience. Its no accident that athletes have to work so hard to get their body in good shape. The flesh is the source of temptation and sin in this life.