The words "soul" and "spirit" are born out of superstition. We are one miniscule part of the tree of life that has evolved on this planet in the last 3.5 billion years. We are not separate from the rest of the animal kingdom. The idea that we are, is an illusion, mostly due to how we seem different, but that seeming difference is only our advancement, largely due to the development of language. Many mistake their consciousness and emotions as "spirit" or "soul", but this is not surprising given that many lack critical thinking skills.
The fact is, everything you are is a function of your brain activity. Full stop. Any thoughts or beliefs that one's consciousness survives the death of the brain is nothing more than wishful thinking, and/or the fear of death and the wish to survive it.