Theology is a systematic study of God. The scripture itself is not pure theology as it does not proceed from definitions to conclusions and only indirectly defines fundamental theological concepts such as divinity of Christ or the Trinity. Much of the scripture is narrative or poetic, or corrects errors known to the recipient of the epistle but not to the casual reader. Even St. Paul's instructions what to do with his wardrobe are in the scripture, but, to pick the titular topic of this thread, the relationship between predestination and free will is not. One reads the scripture and from it forms theology, and different people form different theologies. St. John the Chrysostom did it, and St. Augustine, and St. tomas Aquinas, and St. Gregory Palamas, and those two fools, Luther and Calvin. I think you understand the distinction and try to confuse it for some silly rhetorical point.
People can form all the theologies they want to. Irregardless, God's revelation is only one theology, as there is only one God as contrasted to lots of men who would rather believe themselves rather than God.