@demonhunter,
to have an answer if that is not the case. it's an 'if A is true, then B' situation. the 'if' is still there of course, and simply shows that if the universe does not have a supernatural creator, the soul cannot exist.
i, and no other, can prove whether or not a creator is the source of the universe, but i guess it helps to know that if there isn't one, then the soul cannot exist, therefore if you can perceive a soul, then a creator must exist.
the question you have to ask yourself is this: if you can perceive a soul, you are forced to believe that there is a creator, so what do you do? do you draw a conclusion without further evidence? this is religious faith, a baseless conclusion, but otherwise filled with hope and resolution
on the other hand, if you perceive that soul, and decide that it is simply an illusion in your mind, making your identity and point of observation of your material self just as without value as anything else in the universe, what do you do? this is nihilism, a grim conclusion
either way, if a non-material soul is observing or interacting, it must be doing so from outside this universe. the construct of the Matrix comes to mind, however self-contradicting that may be, but i think you know where i'm going