I think I'm saying this:
1) Foundational presuppositions are the basis of our beliefs; these presuppositions act as "filters" through which we consider the nature of reality. Naturalism posits that only the material world and its measurable/observable phenomenon is the basis of reality; Christianity posits that God is the source of reality. These presuppositions mean that evidence that is convincing to one side of the fence will more than likely not convince the opponent on the other side of the fence - because the presuppositional foundations prescribe what is and is not credible evidence; hence, the Naturalist automatically dismisses all supernatural claims of evidence because God's nonexistence is a given, a requirement for Naturalism. Conversely, the Christian will automatically not consider valid any evidence that suggests that God is not who He says He is and that the Bible is not reliable - because the Christian foundation says that the Bible is the inerrant revelation of God.
2) Naturalists (and often atheists) will insist that they are objective, open-minded, individual thinkers (as opposed to us close-minded Christians who are brainwashed and cannot think for ourselves); I contend that real open-minded people would not dismiss the possibility of supernatural forces at work in our world. As such, I challenge the claimed "objectivity" of the atheist, the naturalist, the secular-humanist.
Let me know if I continue to be unclear (I'm prone to being such).

