Theory of motives of Engineers

As far as I can tell there are 5 main questions left unanswered in the film concerning the motives of the Engineers, which for me is the most intriguing part of the movie. 1. Why did they create humans in the first place? 2. Why did they want us to go to them? 3. What was that pyramid? 4. What happened at the pyramid that changed their plans? 5. Why did they want to return to Earth to destroy their creation? I've had various theories as I have watched the movie, but none of them seemed to pan out since they couldn't answer all five of the questions. But in watching it this last time, and after watching the Fury of the Gods DVD, I think I have a theory that at least answers cohesively all the questions. 1. Why did they create humans in the first place? I could not help but notice how the sacrificing Engineer at the beginning of the movie was wearing a monk like robe that reminded me of a Jedi robe. I get the impression that he was a priest, or at least that he was performing a religious ceremony by sacrificing himself to create humans. The way he even drinks from the cup reminds me of a religious ceremony, since many religions drink from chalices or cups a drink that makes them divine or connects them with divinity. As one who was creating an entire race of beings he had the privilege of becoming their god. 2. Why did they want us to go to them? Here is where I think it gets tricky. Our first instinct is to assume that their creation of us was benevolent and that they wanted good for us. This is because they seem to have went through so much trouble to create us, and then to teach us and guide us back to them. However, I think this is where are instincts are wrong. They did not want us simply to go to them, but they wanted us to go their pyramid. They wanted us to advance enough to find this pyramid since in our advancement we had become worthy to also take part in their religion. But we would not take part as those becoming gods, but instead as those being transformed into the highest of biological species: the Xenomorph. Many religions do not merely deal with creation, but with transformation into something greater. By our transformation into the Xenomorph we would have reached the top of the food chain and thus the alpha species in Darwinian terms. 3. What was that pyramid? This to me seems the most obvious answer. It was a temple. Likely their most holy of places. In this temple they celebrated the greatest of mysteries of their faith. I use the word mystery the way many religions use it, not as something that is unknown, but as a sacrament or a climax of the religious experience. The mural on the wall that Dr. Holloway shines his light on reveals a Xenomorph. But if you look closely this Xenomorph looks like it is being held down by a god-like figure, a god that looks much like God the Father on Michelangelo's Sistine Chapel. It would appear that the Engineers believe that the ultimate act of Godhood was not creation, nor even transformation of us into Xenomorphs, but it was their ability to bring Xenomorphs into submission. They were planning to change humans into Xenomorphs, who were the ultimate in biological evolution, so that they could then bring the Xenomorphs into submission thus showing that they had risen above evolution to become divine and separated from biological entities since they were able to subdue even the greatest of the biological entities. And thus the mural on the temple displays God holding down the Xenomorph, and that was what they were planning to do to us once we found them and were transformed. 4. What happened at the pyramid that changed their plans? I believe the exact details of what happened cannot be discerned by the movie, but obviously something unexpected happened. Somehow, they lost control of the black substance and it began to transform them. Once they were transformed they were quickly overran by the Xenomorph. This would be a total devastation for the religion of the Engineers since it reminded them that they were mortal after all. In their pride in their amazing accomplishments they had thought to highly of themselves and had come to believe they were superior and of a different quality then other lifeforms. But when they could not bring the Xenomorph into submission their religion and their faith in their Godhood vanished and they were brought down to Earth, so to speak. If you think about this, this goes right along with the theme in the movie of loss of faith. At the end, Weyland says "There is nothing." He had met his creator and when he realized the brutality and lack of care the creator had toward him he died with no faith. David, who had realized all along how shallow and uncaring his creators the humans were merely says what he already knew: "I know." Dr. Holloway seemed to have lost his faith that there was anything special to life and that is why he tells Dr. Shaw to take off her cross. And Vickers seemed to never have any faith. By contrast, the captain shows faith in Dr. Shaw when she tells him, "Trust me" at the end of the film, and he trusts her enough to sacrifice his own life. And Dr. Shaw shows that even after all that had happened she still believed. Something David is quick to point out when she puts her cross back on at the end of the film. The Engineers would be keeping with this theme in losing their faith that they are gods and that they really don't have the power and control they thought they did over the universe. This would have been devastating to them. 5. Why did they want to return to Earth to destroy their creation? This one to me was the hardest question to answer. It was the question that destroyed all my other theories except this theory. It would appear to me that since their religion had been destroyed by the realization of the fierceness and brutality of the Xenomorphs that they had no need for humanity any longer. They wanted to undo everything they had done. The experiment had failed and they wanted to contain the failure. They wouldn't want any chance that an entire race of humans would be transformed into the Xenomorphs, and so they wished to destroy humanity to be done with the threat they posed. They never really cared about us. We were merely beings to be sacrificed to their religion. And thus we had no more reason to exist. It might be asked why the rest of the race didn't destroy humanity once they found out about the failure of the religion. This of course cannot be answered but this does not itself destroy the theory. First, like many religions the leaders of the race may have wanted to keep the religious failure a secret. Or second, it may have been that this religion was a secret religion that the rest of the race was not aware of. Or third, the Engineers involved may have been high priests and the only ones knowledgable of the details of the religion. Kind of like the Masons and other religions who learn more and more as they go up the ladder. Perhaps the commoners did not fully understand the religion, so they would not have understood what had happened since they had not yet been initiated into the mysteries. Either way, to me this theory works. I am not saying that Scott or the writers even had a complete overarching theory worked out, but perhaps, like artistry is, in their creative inspiration this is how it ended up coming out. At least this is so far the best way I have found to answer the top 5 questions consistently and simply. What do you all think?