One shock that I had first reading theologians was that not all of them even believe in Christor God either. You can comment on the bible and on theology and not be a believer. What is theology? Essentially isn't it the spiritual relationship between God and man? Someone who is not led of the spirit will never reach the conclusion that the Spirit will lead to.
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.