Lebanon is known for its diversity. It was the last Christian country in the Middle East up until the early to mid 1900s. It has both Catholics and Orthodox, Sunni and Shiites, and even Druze. The upper classes speak French just as well as Arabic. It is inspired by European-ideals like religious freedom and democracy.
The reason for Lebanon's diversity is geography. Lebanon is located in one of the world's crossroads and its hilly landscape makes it easy for embattled groups like Marionites, Druze, and Shiites to fend off greater threats.
The crossroads aspect is explored by National Geographic and an academic paper entitled Y-Chromosomal Diversity in Lebanon Is Structured by Recent Historical Events (PDF). The long-story short is that Christians in Lebanon are more likely to have European traits while Muslims and Druze have roots back to Arabia. The Ottoman Turk conquest of the 1600s apparently left little impact on the Lebanese genetic makeup. Turks conquered and ruled as an insular caste not mixing in with the locals. This was one of the reason that led to their decline.
Interesting note: Proto-Catholicgauze relatives of the M17 line are more likely to be Druze and Muslim than Christian according to the study. This makes sense because M17 is found more in Scandinavia, Eastern Europe, and Eurasia rather than the Crusading states of Western Europe.