Prometheus: The Eluded Truth?

Was thinking about Prometheus's story I figured the first Engineer belongs to a religious division that seeded Earth. A possibility the warrior division may wipe their race out with the bio-weapons one day. So they seeded planets just in case, to ensure that their race survives in one form or another. They also visited the seeded worlds to check on how things are going.

Point of reasons for this: Saucer ship vs Doughnut ship. Military uniforms vs Religious robe. Religious ritual at the beginning. Tech used for death vs tech used for life. The warrior class was engaged that a cheap clone of race is on Earth and decides to end it.

Another thought is that in Prometheus, the bio-weapon was originally created for planet seeding and later went into weapon use. They then decided to wipe out all the seeded worlds especially Earth maybe due to human evolution i.e. in Prometheus humans already can space travel to another system in a relatively short time 2089. Since, they seeded Earth about 250,000 years the Engineers' technology has seems to have made little progress but humans have jumped by leaps and bounds that they predicted that we will be the alpha race as opposed to them in the area of space they controlled.