Everything we do or think involves theology.
Whether we believe we are free to choose a Toyota or Ford, or if we think there is even a moral question involved therein has to do with, ultimately, our world view. We make choices based on how we view the world (and ourselves and God) at a particular time and place.
Don’t misunderstand me—I don’t necessarily believe every choice has to be weighted with the same significance or with severe gravity. I think God gives us parameters, however.
The Bible, I think, has significance for all men. Whether all men choose to accept it is another matter, isn’t it? :)
Whenever we can make a good philosophical argument to do the right thing, then not only do we provide another reason for Christians to behave properly, but we also create an opportunity for non-believers to behave properly and see that Christianity is a rational belief system that works today in the "real" world.