This is all well and good, SmartyPants, but still don't think you're clear about the fact that The Spirit Within is not the be-all-end-all in regards to spirits. It is one of many possible interpretations; it provides an alternative, more mundane explanation for the existence of spirits, if people, such as you, don't like the idea they are dead people. However, it is no more plausible than the alternatives -- there is a roughly equal amount of evidence to support both, as we have already discussed at length. Just like the more central theme of Yahwah's existence, the story is being deliberately ambiguous to allow the player to form their own interpretations. There is no absolutely no "correct" interpretation here.