You should depict the circles with some overlap. And, there should be a rectangle surrounding the circles. The universal set is the rectangle. This creates four regions. The area outside both circles is everything outside of faith and science--music, for example. The region inside faith and inside science are those things. But, with a depicted overlap, you also get things belonging to both faith and science.
We then ask math problems about the diagram. If the area (total area is always exactly 1.0) outside the circles is 0.5, and the pure faith part is 0.25, and the pure science part is 0.25, that totals 1.0 with no overlap (or 0.0 area in the overlap part). You can adjust the amounts in the four regions at will to argue any point you like, including having an overlap part.
Thought I'd beef up your math part to help you out.