The article deals with the mutual relationships between belief (understood as a set of propositions), philosophy and theology. The role of philosophy in relation to theology is direct, as philosophy offers theology conceptual and methodological tools. It is indirect when philosophy attempts to prove some truths of theology and remove obstacles to faith. Not every philosophy is suitable to play a direct role. Christian philosophy is a philosophy which does not contradict belief, its presuppositions and implications, and is suitable to play a direct role.