[MENTION=9401]LucyJr[/MENTION]
Yes it seems we mostly agree.
However I posit that there's nothing non-mechanical/material. Why would I posit that?
Because some things are clearly not possible, and to have the impossible (or the possible) there must be material mechanics. For example, if I have a soul, maybe I can't have your soul as well as my own. Maybe I can't be God either. If I can't do these things, there has to be a real and actual reason that I can't do them, otherwise I'll be able to do them.
Yes, I think that something would be ones own nature. For example a ghost (if its to exists), it has a certain nature, with certain properties. Given those properties, that ghost is limited to the material world to an extend. She can see, walk (sort off) in material world. But she can't interact with objects, she can't "hold" material things, she can't feel in a phisical sense nothing from the material spectrum.
But this is again depending of situation. For if theism is true, then God would be the "nature" giver/establisher. He would put the borders, the limits to each objects inside His creation and creation itself.
In a theistic framework, things starts from above, from "up there", from a Being that is Perfection, from a Being that is The Essence, that can create and limit the things created. In this framework, goodness would be real and objective, intrinsic grounded by the nature of God. Evil would be something which is fake in his nature , like a parasit, something that "steal" from the essence. This is the same for order. Disorder would be a fake, something that "steals" from order, which is alone essence. The same applies to beauty, reason and other qualities.
One other think would be that in this framework, only God could be God, meaning that any thing can't have the ability to go pass beyond his very nature. Morever, it means that even God can't create something which could be another God, because that is impossible.
In a atheistic framework, the plot/the reality would have been exactly opposite. The reality goes from simple to complex, from disorder to order, from appearence/form to essence, from non-value to value, from non-reason to reason and so on. If this framework is true, then anything can pass beyond its very nature, because there is nothing that limits or hold anything.
In metaphysics, one can become, and overthrow God, because there's nothing which prohibits you from doing so! Without a material realm, you'd be able to do anything you can imagine. If I fancy myself as a goddess, I'd become one, because what can stop me? If there's not something that can interact with my essence in a real and mechanical way, then there's nothing that anyone or anything could do about it, is there?
If God would exist, then I think the answer is no. Ones very nature would limit in doing so. And, as I said, if God would exist, then nothing that is created could became God. Not even God himself could do such a thing.
This is because the very nature of God is in such a way that is stand-alone, that can not be reproduce or created. God is by his nature an eternal being, with no begining and no end. If God would create a being that is to be God, that would be impossible, because its very creation (of that being) implies a begining, thus meaning that the respective being can't be God.
Edit:
Also, in a theistic framework the only thing that is ever-lasting, stand alone in its essence would be God, and God is a spiritual/methaphisical being. He is not material.
On the other hand, in a atheistic framework, everything would start from the matter, and eventually would evolve to spiritual/methaphisics.