Okay, I think this has the potential to be (and is already beginning to be) a very good discussion. I want to emphasize, however, that we really can't answer your queries in a direct way, because it isn't obvious at all that the "answers" are directly available in any of the source material. All the "answers" we get seem to be, at least to some extent, metaphorical. Since a metaphore doesn't have to be perfectly isomorphic with what it represents, you might find problems with the metaphor that aren't problems for the reality. But all we have to work with is the metaphor! (Actually, several, seemingly conflicting metaphors). (But keep reading, I'll come back to this).
Another issue is that some of the problems TES lore deals with aren't obviously easy to answer even in our world. Think of the old problem "where did the universe come from?" Or "is reality infinitely divisible or does it contain certain fundamental, indivisible objects?" As far as I'm aware there isn't an answer to these problems in the real world which garners general philosophical consent. (Kant didn't think they could be answered at all!) If we have trouble with these questions as regards the real world (and they're very old questions), it should be no surprise if the answer in the ES world can be difficult to swallow. So, I'd advise for some issues, just make as much of what is presented you can make sense of, and then build off that.
Thanks for the advice. After writing this forum post and thread and reading your post I began to realize that perhaps not as many people are as disposed to building a framework for the universe as I and my peers in real life are. I would actually discuss this with them, but they are not interested in fantasy in the slightest (especially a videogame)
We do not know if the universe will expand infinitely yet (I don't believe), but I personally subscribe to the idea that it may. In any case, the discoveries in quantum physics really imply that the universe seems to be infinite in just about any direction we look (which is disturbing to the the evident framework of how things seem to be. I have had to rework my thoughts on how the universe works several times thanks to quantum physics.) It may be true that no matter where we look, reality may be infinite* in every direction and there is no fundamental object (although I was hoping there would be). But I am getting off topic...
Okay, now I want to turn more specifically to your questions. You ask about immortality and power. I think you're over anthropomorphizing divinity in TES. "Gods" in TES have sort of a dual nature: they are in an important sense "persons," but in another important sense they are concepts. Are concepts mortal or immortal? See, that very question is problematic.
Perhaps I am not understanding completely what you mean by concepts here. The way that the "Gods" exist in TES have evidence of existence don't they? I know of a few that do. It is one thing to conceive of something like a perfect state of being, and another for there to be a real person who is absolutely perfect.
You also ask about the Heart of Lorkhan. There is (what I take to be) a flesh in blood heart buried under Red Mountain (though it's post-Morrowind, post-Infernal city status is unknown). But the Heart of Lorkhan is the Heart of the world, both in the literal sense (material heart for a material world), and in the metaphorical sense (imbues the world with life-force, etc). Again, we have the merging of an animate thing (anatomical heart), and a concept (metaphorical heart).
So earlier I said that we've been given the metaphor (or even, many metaphors), but not the reality that the metaphors correspond to. So here's the proposal (you already know what it is): reality is the metaphor.
(That's not strictly true either, but it's helpful to say why not).
So some things that are non-sensible are perhaps anthropomorphism manifest?
Ait, going to attempt to answer some of this.
The Godhead is essentially the same http://en.wikipedia.org/wiki/Godhead as in all (or at least most) real world religions. He is the original force who creates or out of whom the world is created. He is most evident in Christianity, where he is the Father of the Trinity, and in Hinduism, where he is Brahman. In TES, he is the supreme consciousness who, due to his isolation, has become schizophrenic and splintered himself into a multitude of personalities. The first of these were Anu/Padhome, and then they splintered into Sithis/Auriel, the Aedra, Daedra, men, etc. The http://www.imperial-library.info/content/loveletter-fifth-era-true-purpose-tamriel provides a good explanation of this, you should check it out if you haven't already.
Unlike Father of Christianity, he does not (cannot?) directly control the world*, and neither can his initial subgradients. Akatosh and Lorkhan are the first to have actual power over the mortal realm, since they are the highest beings to partake in its creation. As has previously been stated, each god only controls their own realm. Furthermore, some of the Aedra actually sacrificed parts of themselves to create the world, and as such have little, if any, power remaining. Although my memory of Greek myths is rusty, I believe Gaia to be a suitable comparison, as she is the earth but does not directly control it.
A 'finite' soul is therefore anything thats not the all-encompassing Godhead. However, this terms is horribly flawed, as all people are essentially just hallucinations of the Godhead and all are the Godhead. This is what makes CHIM possible: you realize that you are everything, and therefore nothing (as you are no longer individual), but manage to hold on to the concept that you are your own person.
First let me say thanks for your contribution. Very helpful.
To define finite and being infinite or almighty might be good to further clear things up.
Even though everything in the universe is made up of the same base elements, who we are and the power we wield is finite. To be
finite is relative to our existence, which should always be defined as the sum of our parts. We exist as humans, and the concept and boundaries of what it is to be human are self evident and are not something we need to learn. Assuming the universe is infinite and that we are a part of it, just because it is made up of the same elements doesn't put it as an extension of our person (an example a left-brained friend of mine gave me once, was that our existence as a human can be likened to the water arch that you see when you spray water out of a hose. You recognize the arch and can identify it, however the water that is constantly moving through it is changing while the appearance remains the same. When we eat food and digest it, constantly moving particles and elements through us while we keep moving through the universe we change. Yet we are defined by remaining in this shape and existence as self evident humans. We are the sum of our parts.) The same could be said of this "Godhead" you mentioned. He may apportion some part of himself to make a creature (conceptually) but that creature's existence isn't part of the "Godhead" anymore than my existence is part of the whole universe. I am defined by the sum of my parts, and my existence is finite defined by my boundaries as a human.
An almighty being isn't necessarily infinite in power, just someone who posses all available power. It seems that he may choose for himself how it will be used, whether to be omniscient or omnipresent or to not be any of those things. This is the interesting thing about the one with all power, and further defines his person.
An immortal being would be one who's definition of existence cannot be threatened to change. In fact, an immortal being is unchangeable.
A mortal being can change and also are not guaranteed an eternal existence. The "sum of their parts" are either constantly changing or can be changed by others, where the immortal being does not have this existence.
There are other more refined definitions but this will suffice for our discussion.
The Dreamsleeve isn't a machine or a person, its an undercurrent/dimension running through the world. Another part of the Godhead's consciousness, the eternal creative aspect if you will.
As complex as that may sound, its really the simple explanation. As Dumbkid mentioned, gods are as much concepts as they are 'people.' As Prowler mentioned, the beliefs of mortals can impact the nature of gods: http://www.imperial-library.info/content/shor-son-shor is a great example of this, where each race of peoples has their own concepts of the same god.
*this isn't wholly true, but theres not enough space to go into the intricacies of theology.
I use machine loosely as I consider most anything that has a function a machine. Meaning that if you could actually comprehend how it works it would be as good as a machine. Humans are complex machines, for instance.
It is interesting that the "beliefs of mortals" should impact the actual nature of gods. I would want to explore what that means much more. There are certain observations in quantum physics that seem to indicate that perhaps the universe as we see it bends to our consciousness, but that is a bit "spooky"
Your not reading or interpreting it wrong, you simply don't have the whole truth. The Heart (also know as the "Heart Stone"), is not an actual heart of flesh and blood. It is the "heart" of Lorkan that was ripped from him as punishment for causing the creation of the mortal plane. By "power source" that you refered to in your post, you must be talking about how the Heart is the power source of http://www.uesp.net/wiki/Lore:Akulakhan. You could also be refering to the Heart as the "power source" of the Red Tower (Red Mountain), one of two towers (The other one being the mystical White Tower that physically manifest itself as the http://www.uesp.net/wiki/Lore:White_Gold_Tower and it's power source is the combination of the http://www.uesp.net/wiki/Lore:Amulet_of_Kings and a Crowned Emperor, because without an Emperor, the amulet alone with powerless) that maintain the barrier between the Mortal Plane and the http://www.uesp.net/wiki/Lore:Plane_of_Oblivion.
I hope I this cleared a few questions.
It does thank you.
So between the answers I have seen, it seems this figurative heart of Lorkhan, who wanted to create a "mortal" plane which I will believe to mean it will contain finite creatures was punished somehow by having his heart removed from him (figuratively?) and then it has become manifest in a real place in space/time as a sort of reality metaphor? Is that about correct? That is a much better understanding than the one I started with, so thank you for your help.
The question I would have now is who is actually interested in making an anthropomorphic heart in the "mortal plane" and how it has a power source. If anything, since this was to represent an actual figurative heart that a "god" had once possessed, it would seem that the heart's power wasn't in strength but in ambition and idea (as that is what the figurative heart often means in literature). It should grant the person who can use it the ambition and idea of Lorkhan, whatever that implies.
Well, fantasy is the hardest genre for those poor unfortunates called "right-brained people" to suspend their disbelief in.
I am unfortunately plagued with this birthright. I have some friends who are the exact opposite, very left brained and I try to feed off their ability as much as I am able. I cannot permanently sustain a left brained mind on my own, but I try.
*Somebody mentioned that it was an absolute that since the universe appears to be infinite (and for discussion let's just assume that it is), that Tamriel already will exist in an infinite universe. That is not true. To put it tactfully, the word infinite doesn't equate to infinite possibilities when used in a sentence (like I have a bowl of infinite chicken noodle soup, therefor in my bowl all things possible will take place). It is no more probable that Tamriel will actually exist than a trillion variations of Tamriel will ever exist. The universe as we perceive it doesn't actually bend to abstract concept. For example, let's say that I conceive of a world where people are made of Jello and that they are ruled by a race of string cheese people and their sun is made of blueberries. The universe is infinite, so this has to happen at some point right? It becomes easier to see the fault in that assumption when I put less reasonable abstract into the theory presented. Tamriel and all of it's ideas, concepts and laws are no more probable than the example I have given. The reason for this is because we already have observed constants and laws that are used in the makeup of the universe and they are not likely to change at any given time in the future (seeing as they are constant, and have proven so in the past). These points I bring out should be self evident.
Of course it's not unheard of to postulate strange ideas. Most of the things we have discovered about the universe already would have sounded like quackery to people just a few hundred years ago. But there is no substantial evidence that Tamriel exists now or will ever exist in the future (it sounds about as reasonable as saying that there must be a planet in the shape of a perfect triangle somewhere since there is so much observable space and also an apparently endless source of building elements to make one, if one were so inclined). The elements that would need to exist for a living Elder Scrolls World to be true haven't become manifest, and I don't believe they ever will be.