This study presents the thesis that religious cleavages in Lebanon have been the major factor behind most of the country's problems since the achievement of independence in 1943. The coming of the Palestinians in 1948 and in the 1970s upset Lebanon's delicate sociopolitical balance between Christians and Muslims in favor of the latter. The study's four chapters describe the origins of Lebanon's religious groups, the arrival of the Palestinians, Lebanon's emergence as the sole Palestinian guerrilla base, and the outbreak and aftermath of the Lebanese civil war of 1975-1976. Finally, suggestions are made for the resolution of the continuing Christian-Muslim conflict, notably the alternatives of federalism and confederalism as possible future political arrangements for Lebanon.