For example: persons of any of the Christian faiths believe (often claiming to 'know') that Jesus is the savior of the world. Persons of the Jewish faith believe as strongly he is not. Yet after millions of human-hours of prayer throughout history their god(s) never tell either of them there is a problem with their chosen path.
Christians 'know' Jesus is the Christ, and Jews 'know' he isn't. In both cases the information supposedly comes from the same god. Both sides claim this god is perfect, yet his answer changes depending upon who asks it.
The problem is not isolated to the supposed divinity of Jesus. Any answer which is relative to the asking party displays this crack.