1) the "your screwed" message is just the basic negative feedback system of the body. Receptors send message to the brain, brain sends message to the appropriate organs to respond to the issue. The nerves in your neck and spinal chord would tell you brain you body is now absent, brain now has no way to supply its processes. Just using creative writing to add spice. In future ill just remain silent sheeesh
2) I did not LEAP to the divine spirit resting in the skull. THAT idea has been around for thousands of years. People keep skulls of their relatives once they die(some African tribes). The eating of brains to gain peoples spiritual power,strength, intelligence etc. Then u have the idea of the traditional christian saying you are a spirit in your whole entire being which then goes to God once you die.Along those lines there are also other religious sects and cults that believe that your heart and blood is the source of your spirit. If in fact "you"(conscious abstract thought makes us human and one step beyond the "souless" animal) remain alive once your body is giving a lovely death rattle on the ground next to your blinking head.
So would the fact that you are still blinking after being detached from you body prove an entire group of religious beliefs false ?