What I don't quite understand is if they created us humans, why they then try to wipe us out (at least, that's the assumption the characters make when the Space Jockey heads for Earth).
That's the entire point of the film; and why it ends with the archaeologist heading off in search of the Engineer home world with that exact question: "Why did you change your mind?"
Hopefully that means there will be a sequel.
According to that article (which quotes Ridley Scott from an interview), there was an event, 2000 years ago, that made the Engineers want to kill us.
2000 years ago? Jesus Christ.
I'm not kidding. Read the article. Ridley is putting it out there that Jesus was an Engineer, and we crucified him.
Thus, the Christian motif in the film.
More about this in the article linked above.
EDIT: Just thiking out loud, I took the planet where the film takes place, LV 223, and I thought....I'd see what Leviticus 22:3 says....
22:3 Say unto them, Whosoever he be of all your seed among your generations, that goeth unto the holy things, which the children of Israel hallow unto the LORD, having his uncleanness upon him, that soul shall be cut off from my presence: I am the LORD.
Hmm...interesting. Goes with the film.
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