The aim of this thesis is to demonstrate interrelatedness between various concepts of God and metaphysical assumptions from which they have been derived. This will be done with special attention paid to philosophical work of Bernard Lonergan. On Lonergan's case I will show his solution of problematic presuppositions of scholastic understanding of God. In introduction I will summarize reasons that made me to choose this topic, goals of the thesis and methods I will use. First chapter will be dedicated to brief introduction of selected proofs of God's existence and their metaphysical premises on which they rest. Enlightenment critique of metaphysics will be described and its consequences for metaphysical proofs demonstrated. Second chapter wi...