Angels and Humans are born from Adam and Lilith respectively.
Adam ate from the tree of life, so his offspring are fucking HUGE, superpowered, and solitary beings who are near-godlike.
Lilith ate from the tree of Knowledge, so her offspring are small and weak, but capable of building, inventing, creating, and survivng through intelligence and ingenuity.
Adam and Lilith seeds aren't supposed to land on the same word, they were made by a kind of ancient race to spread life throughout the universe, send in white and blakc moons with scrolls that contain instructions on how to use them, and a Lance of Longinus just in case both DO land on the same world.
the dead sea scrolls contain instructions for a number of things, the things Eva are concerned with are:
2) How to destroy Adam/Lilith in the event both seed the same world.