Well generally I hold the opinion that such externalization does indeed lead us from ourselves as the inspirer of all that exists and the realm into which we birth. If such does really exist... the only way to outrun the grasp of such entities is indeed what is affirmed in Buddhism....they do not ultimately hold such powers, all is of causative origin, and that understanding, denies that which affirms their existance...mistaken inherant existant quality belief. Is this not upon which as the Buddha states...it all revolves.
So to my opinion this is why the buddha though stateing certainly, such as expressed in the Brahma sutra.... these beings being deluded, the focus is on ourselves, as inspiration and controlling factor in such things, and any controls they may seem to have over us.
So externalized or internalized..... the way out is the same, through understanding of what the Buddhas core teaching is.
To my personal view we look at our realm of existance of solidity and the way things appear to us as exclusionary to other existances. Imagine perhaps if there was other realm parallel with ours in which the beings and beings that consume things and objectify in such manner.... as we do with percieved apparent solid objects.... things that we perceive as not solid....awareness aspect itself.
In such a realm the solid would be perhaps awareness aspect of emotional content itself. And if a creature did abide suchly and having a subject object relationship established in core in purer form than human..... would not be what they eat..... aware aspect itself?
Suchly they would reap what we sow...which is our emotional involvement in things. The intense hate fear joy and on and on. We could not of course surpress such things, the supression itself would be like trying to surpress water in a cup, it would arise elsewhere. The issue would be to prevent the content itself from holding perceived content of water...this emotional response. By clear investigation we could perhaps determine such is not water itself but since we are thirsty it appears so(our self concept creating this thirst which precipitates as self other and eventually our found reality this realm). Found to be of other origin, this water and consequent thirst.... we could then do with it what we feel.
Gods (or demons cloaked as gods) their greatest fear is such a place would be, since inherant existance, self creation and replication and maintance of a god like status being most important to them(found by studying their derivitive or origination)......would be, the opposition to all they represent....noninherant existant quality. So they would reinforce by creating godlike worship and such things, to affirm their "devine" nature.
Now prayer, faith, and devotion, based upon noninherant existant quality may be a very important, perhaps indispensible, part of dissolution of the me(which is what has us causeing all this). But with focus of such on inherant existant thing such as a theist god, it becomes not a dissolution of self, but a reaffirmation of self or deviation from understanding. As in the theists inclination to state their god created humans in the gods image...that type of thing. Affirmations of human seperateness soul and all the rest which affirms the emotional respone to thiings. Seperations perception I me mine self other being at the heart of it all.
So we have perhaps these noninherantly existant beings, who themselves naturally, internally doubt their existance,(the basic foundational concept is consequently conceptually based and thusly faulted) but want to most of all firmly create a realm or environment in which they are affirmed as inherantly existant.So thusly if such a realm did exist under these constraints...they would indeed cause all overtly conscious beings to worship them(it reaffirms their considered inherant existance and creator of thngs envisioning) and if they do indeed objectify, as such a being faulted being be.....what is to say the essential objectification in such a godly realm be not awareness aspect itself. A godlike status would imply certain understandings from which are essentially derived their "powers". Closer to the real they could be approximately described than humans. Consequently their perceived powers.
Ultimately are not even inert objects such as the nails on our body and our hair and us being a microcosm not also our entire reality...... inert stones mountains and such, a extension of sorts of awareness..aware aspoect...it seems so.
So why the middle man if you are god in such and are inclined to objectify...why not establish the subject/object relationship with the awareness itself? Why create the inert and all the rest, the tales of woe the humans subject themselves to? What does all this sad tragic play create, but emotional response only...in the end. So if you were such a god/demon it would seem that perhaps awareness aspect is what you would consume.
So how better to eat such..... then to create a environment in which beings which have tendency to produce such(emotional responses) of most suffering. YOu must not only have these beings but you must manipulate their environment to propogate their kind(make it internal to their religion perhaps) inspire the technology perhaps to enable the propogation in a great manner..... and you must produce circumstance of great tragedy. A race of beings that always comes so close, but always fails in the end. How better to produce such emotional states? What greater emotion is produced by tragedy and its perception in the human sentient being....none. There is no greater emotion produced anywhere at any time. Some with death some with regret some with pain and normal suffering of life...but all enhanced greatly with great disastor of any sort and consequent tragedy. And large large amounts of beings that consciously can perceive such tragedy.
So you create these various things...these theisms which have worship of you, these religions that inforce propogation of human(since this is what you essentially eat their aware aspect production), and work to create circumstance of greatest tragedy....everything quite fine for quite some time until...rapidly and quite unexpectantly it all comes crashing down. Circumstance created perhaps with your determining influence.
So that is how it could be. But it probably does not matter a whit, since wether the god/demon is external or internal the way out of the prison is the same...understanding lack of inherant existant quality to all gods demons and most importantly..self, (AS a aside some shamanistic theory has a other being of extraterristorial sort inhabiting human beings in a one on one relationship a deviant perhaps of the same sort of thinking).
I ramble on and few if any are probably still reading at this point...but I find this could be how things are. This theory would allow for all possibility of existance if each is studied. So it interest me, though ultimately it is of no consequence.
If I need cause for preseverance in my spiritual path I do keep such envisionings in my mind as they for me, provide motivation to free myself and all others from this tyranny. To fully understand lack of self in myself all other things and lack of inherant existance in all things.
I being a layperson with little understanding of things cannot of course say this is how things are or not....but it seems so and seeming so serves purpose. Millarepa's cave demoness of course would not remove until he found the enemy of self to be nonexistant. Suchly we must also. Does the cave demoness Millarepa found, really exist.... that probably is irrelevent.
SElf it is that derives this thing real or not.
So I ramble on, my appologies to the initial poster for deviating from point.
"This order considers that progress can be achieved more rapidly during a single month of self-transformation through terrifying conditions in rough terrain and in "the abode of harmful forces" than through meditating for a period of three years in towns and monasteries"....Takpo Tashi Namgyal.