Dietrich Bonhoeffer and his brother Klaus visited Tripoli in 1924. His thoughts on Islam…

In Islam everyday life and religion are not kept separate, as they are in the whole of the church, including the Catholic Church. With us one goes to church and when one comes back an entirely different kind of life begins again…Islamic and Jewish piety must naturally be marked religions of law, when the national and ritual elements are so intermingled or actually identical. Only in this way can they achieve such a strict demarcation from other races and religions…  

Eberhard BethgeDietrich Bonhoeffer: A Biography (Revised Edition); Chapter Two: Student Years: 1923-1927, 58.