I wanted to pose a question regarding presuppositionalism in regards to logic. I believe that I am correct in saying that presuppositionalist say that logic cannot be supported by the unbelievers worldview. However, I am not sure that a theistic worldview is necessary to give an account of logic. My reasoning is that logic seems to be built on self evident laws such as A and not A. It seems obvious to me that one can self evidently perceive apart from the existence of God that my car is not both in my driveway and not in my driveway at the same time. Any thoughts?