The Concept of God and the Question of Its Truth.
Philosophical theology has a place in a discussion of the Christian faith.
We can only talk about Yahweh as God and affirm Jesus Christ as deity if we understand what those terms mean, some would say. This in no way claims to be the only way to know God, or even a sufficient way, it simply means we can know something about God from nature or reason. Questions about the validity of Natural theology begin in Schleirmacher, though the idea is not totally rejected even in Barth. Barth says that our knowledge of God comes primarily from God's revelation in Christ. Vatican I reaffirms traditional Catholic perspective that Natural Theology does exist and that we can know the existence of God and the fact that we are sinners by reason alone.