Two people wake up in a room with no windows.  They have no memory of who they are, where they are or how they got there. After a while, they notice that there is an object in the room and that this object can perform some important task.

In the beginning, since they do not know how the object is able to perform its task, they attribute this ability to "a superior being, a god". After a few months in the room, they are able to open the object and study it, and thus come to an understanding of how it performs its task.

They then think "we don't need a god to explain how this object works; science is sufficient". What they fail to realize is that they still have no idea what/who put the object in that room, and that an understanding of how it works, while practically important, is philosophically useless: it renders them no closer to understanding where they are, how they got there, or what is beyond their room.