The belief that religious knowledge can be obtained by human reason by working upon information gained by observing the world and all its wonders, as opposed to the more usual revelation by faith or reading the Scriptures. It was Thomas Aquinas (c. 1225-74) who formulated the distinction between natural and revealed theology, as opposed the older Augustinian view that there is no knowledge of God except through revelation.
The subject of theology is not the usual area in which issues of science and pseudoscience can be contrasted. But when a theology claims that fundamental knowledge, even the knowledge of God, can be sought by rational reflection without the use of revelation, then science is immediately involved. The world “science” comes from the Latin “scientia,” meaning knowledge, and one of its characteristics is its universal quality: Its truth does not depend on adhering to a specific form of revelation, so, at least in theory, Natural Theology and Science should be able to engage in a dialogue. In fact, a dialogue was the result.