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.
I call it a poly-hypothesis.