If science means knowledge, received and rationally reflected upon, we can describe what we have as knowledge, which again doesn't create norms, but reveals them. We reveal the values of revelation which bind us in their truth and goodness. The communication of this divinely received knowledge is not chaotic, but organized, referring back to the truths we gained through reason. Our questions are certainly justified. Our reason needs to be satisfied.
Moral theology can take steps that are intersubjectively justifiable.
Without faith in the veracity of Scripture and the magisterium, there would be no theology, though there could be ethics. But we could arrive at true conclusions outside of theology, but with great difficulty. Since theology is the communication of knowledge having its source in God, it must lead toward faith, toward God, and toward salvation. Theology leads to an ordering of grace, to be able to use it in our lives for God's purpose. Together these two elements form the new dispensation.