Thoughts after 2nd viewing, artbook, and overall theme

Saw it for the second time last night and also picked up the artbook... I think some points of the plot that we are all debating are more concrete than I originally thought..The opening is the seeding of planet earth, and the the black goo is housed on the ship with the intent to return to Earth and either wipe us out completely or evolve us into something else--either way the Engineers have turned on us. A few things I picked up on: I believe Holloway is not looking at the Engineers in as religious a view as Sahw but rather scientific--while Shaw is the one with the more reverential view...which also explains Holloway's intense disapointment--he want to see something concrete--like a live engineer. He is only perked up at the info about the concrete DNA match. As David asks him--how far is he willing to go to see these scintific origins--all the way.... I believe ther is more to the captain then appears at first glance...Why does he lie to the folkslost in the pyramid about the feed going out while he is clearly looking out? Why does he give a sort of wink after telling them they have to stay there overnight? What does David tell Weyland is premature when communicating with him? I am not sure ...maybe he woke up premature as there is no "cure" yet? Originally I found the film sort of nihiistic--there is no God--there are these superior beings who have turned on us--but after a second viewing I am getting a different message--I really think the theme of the film is that there is no point in focusing so much on WHY ARE WE HERE? and WHERE DO WE COME FROM? as much as we should be focusing on how to help our fellow man in the here and now..Who are the real heroes here? Those who deal with the practical at hand issues---The captain and his men who sacrifice themselves to save mankind, Holloway sacrificing himself not to spread something to the ship, perhaps even the engineer at the beginning sacrificing himself to develop life....What happens when we look past the here and now and fellow man--we pursue goals that lead to destruction..which connects with ridley's statements about the ills of religion. Shaw's deterination at the end to keep going is not a positive trait, rather a failure to see the truth--it does not matter why we were put here--it matters that we do the best we can with our time, and as David says--why the engineers turned on us is irrelevent... Sorry for rambling, but this damn film is stuck in my head :)