I would rather state that the soul, if nonexistent, was created to allay fears rather than to inspire them. Fears of the unknown, especially death and the continuation of life after death. Basically, the soul is something that would carry on even after the physical body is gone, something that will remain even after things of this material world cease to be. That is, if I believed it didn't exist...I haven't even answered the question for myself, yet, though. After all, consider anecdotal evidence. It could be dismissed as heresay and the desire of people still living to have something survive of their lost kin, but could it not be true, still? Is it not possible that, despite the lack of proof, it does exist in some way not yet measurable by material instruments due to its nature of transience and nature unaffected by the material world? If the observer affects the observed, and the theorized observed cannot be affected and return a reaction, is it not plausible the observer could not thus observe its existence?
Or is it like the invisible pink unicorns, believed to exist only because there is no proof to the contrary? One cannot prove a negative; the burden of proof, out of necessity, must fall upon the one who asserts that something exists, because of this. For the lack of proof of the existence of the soul, there is proof therein that the soul does not exist. Scientific rigour has failed to find the soul in all of these years, and does this mean that we have been searching for something that does not exist?
Haa~, but such things I should not discuss too much...I just get lost in my own musings...