The references quoted by Pope Benedict explain some of the divergence between the Christian view of God and the Muslim view.
In the Christian view man is made in the image of God, and this likeness includes the logos rationality of God.
In the Muslim view God is so far away beyond our perception that we can't say much about Him or his motivations - so He acts, as far as we can see, at random, unpredictably. That view leads to a devaluation of human reason. And it limits our expectation of being able to relate to God and limits our expectation that He should act in consistent ways.
This seems to explain some of the differences between Muslim and western cultures.