Sorry, but no, it operates on another level, like Blade Runner does. Stripped down to the way you're analyzing Prometheus, Blade Runner would be a half-assed detective movie with undeveloped characters and a lot left unresolved. And yet it is one of the greatest films ever.
edit: A quick search for discussions about the movie yielded only countless threads and newspostings of people demanding answers. It is as if they see the destination and not the journey as the valuable experience. Tragic, but in this era, unsurprising.
The great stories throw you in with the characters mid-stream, and you ride along with them for a while. You experience their trials and triumphs, and you are left without knowing the "happily ever after". It is better not to know. It is always better, without reservation, to not know. The screen goes black, the last page is blank. Not in the more recently common sequel-cliffhanger mechanism, but in the faithful open-ended allowance that we cannot know, that the questions raised are more important, more interesting, and make a longer, deeper impression than any resolution proposed ever would.
We would not, to this day, assail each other on the internet, television, and in the other media on the question of divinity if such a being were to pop out of nowhere and say "yep, in case you were wondering all this time, here I am to confirm that I do exist. Bye". There's no wonder in that, there is no faith in that, there is no mystery. It makes a boring story, regardless of your beliefs.
Some of my favorite films are The Fountain, Abyss, House of Flying Daggers, Blade Runner, V for Vendetta, Lawrence of Arabia (ironic, given its use in Prometheus). In all of these save the last, the fate of the protagonist remains unclear. In all of them, the story would be ruined were it otherwise. The story would be ruined by any of the unanswered questions being resolved. For example: Blade Runner - origami figures, Rachel's status, Deckard's fate. The offworld wars. Just Roy's poetic description of them is enough.
House of Flying Daggers - fate of the protagonists after the duel in the snow. Gravity of choices.
Abyss - What happens next? Better left to imagine. Why were the aliens there? Are they aliens or just unusal undiscovered life? These questions, and not their answers, make the story interesting.
Few stories with resolved questions can truly be great, except when they make up for this in vast scope. Those with such a vast scope generate myriad questions so that the answering of some does not diminish the wonder of others - Lord of the Rings, for example.
The master of such writing is Gene Wolfe, whose novels I sincerely hope never be adapted for film, given the current mindset of audiences and film-makers to strip wonder and ambiguity in favor of action and political themes.