I am not talking about what muddle-headed JWs personally believe. I am talking about one of their most fundamental doctrines about the nature of life.
The soul and the spirit are not the same. The body needs the spirit in much the same way as a radio needs electricity—in order to function. To illustrate this further, think of a portable radio. When you put batteries in a portable radio and turn it on, the electricity stored in the batteries brings the radio to life, so to speak. Without batteries, however, the radio is dead. So is another kind of radio when it is unplugged from an electric outlet. Similarly, the spirit is the force that brings our body to life. Also, like electricity, the spirit has no feeling and cannot think. It is an impersonal force. But without that spirit, or life-force, our bodies “die and return to the dust” as the psalmist stated.