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Notes -
Islam is certainly a religion of law to a much greater degree than Christianity. A common Islamic criticism of Christianity is that it is a regression; it has not transcended the need for law and replaced with grace, but rather by abandoning law it has removed the possibility of grace.
One consequence is that you find that legal reasoning occupies a much higher place in Islam, and abstract theology a much lower place. There is theology in Islam, but it's fair to say that fiqh occupies a higher place; much the same way that canon lawyers exist in Christianity, but are more peripheral. If you think about the major schisms in Christianity, they are mostly about what is permissible to believe, whereas the divides in Islam tend to be more legal or even political in nature.
This is a tendency and not absolute. There are theological differences in Islam - for instance, a noticeable difference between Sunni and Shia is over the question of whether God should be wholly identified with his attributes. Some Islamic thinkers have argued (e.g. here) that the Qur'an simply does not have a theology, but rather has an 'ergatology', a doctrine of works. I think that's going a bit too far myself, and the Qur'an does have a theology, but it is true that the Qur'an is primarily concerned about how to live well.
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