Theology needs more Logic!

Attending a Catholic University has its benefits. One of them is being surrounded by very intelligent people who are willing to engage in 'larger than life' debates about hugely important issues. I spend my days discussing metaphysics, ethics, political theory, economics and, very often, theology. Theology is, as far as I can tell, a branch of philosophy which limits itself to the study of God and the world as a relation to God. Most people, however, seem to think of theology as something very separate from philosophy. There is also an important repercussion to this branch having broken itself from the philosophy tree. Philosophy itself is actually a very exact art, akin to mathematics. Slight mistakes here and there can lead to utterly disastrous results. This is because both mathematics and philosophy, as conceptual creations of the mind, have the same roots. They are rooted in the process of logic. As I said, theology has broken somewhat with this tradition. Theologians often say things which simply cannot be true.
For example, let us consider a very basic tenant of the Christian faith which seems perfectly fine until it is examined with thorough logic. Namely - God is omniscient and omnipotent. I myself never considered this to be a conflicting or wrong statement, until reading the following passage in Ludwig von Mises' Human Action:
"Are omnipotence and omniscience compatible? Omniscience presupposes that all future happenings are already unalterably determined. If there is omniscience, omnipotence is inconceivable. Impotence to change anything in the predetermined course of events would restrict the power of any agent."
The logic is clear as day, an omnipotent being cannot be omniscient and vice versa! But theologians place quite a bit of their other reasoning on this contradiction-in-terms being true. There are countless examples of such mistakes throughout theological arguments. I would not single theology out so much from other branches of philosophy if not for the fact that it claims itself to be so key. Theologians can rarely see beyond the tip of their own nose. Sadly, most people follow their teachings as if they were sheep. People never question anything with regard to theology out of fear of being branded as disbelievers. But belief is by all means a most overestimated virtue...