In the beginning God...
Begin with that premise and one will have the beginning of wisdom. Then, one can ask, “How does it work?” and get the right answer. Until then, now matter how well written, it’s all speculation. God said he would show us wonders in the sky, so expecting guidance toward the truth, can be reasonably expected.
Evolution is not a science because it can not be duplicated in the labs. You are correct—it is speculation—it is a theory. Granted, the same thing can be said about Creation, but faith in the God of Creation is really all believers need to know that it is true. “And he is before all things, and by him all things consist” (Colossians 1:17).
Jesus Christ is the God of creation.