Birds fly by instincttheir understanding is built in on a genetic level . They don ' t do faith . Humans do not instinctively believe in god . If they did , then there wouldn ' t be so many completely religions . And no , faith doesn ' t mean belief in silliness . But if you ' re talking about faith in the existence of an actual thing as opposed to trust in something that does exist , and there is zero evidence that that thing actually exists , then that particular act of faith is pretty silly . And more importantly , you didn ' t address what I said . If you claim that god is not understandable , then you can ' t claim to know anything about him , including that god ' s actual existence in the first place . And that ' s not even bringing up the idea that , if you can ' t understand the god , then you don ' t even know if actually deserves to be worshiped in the first place . Put it like this what ' s the difference between a god that is invisible , intangible , noncommunicative , completely nonunderstandable , that you have to have faith in its existence because you can ' t get evidence of its existence , and a god that does not and has never existed ?