Lebanon was a Christian-majority country prior to the mass wave of immigration in the 19th & 20th centuries and if we overlook this historical fact, it still retains a sizable population of Christians that makes the idea of an Islamic theocratic or fundamentalist rule highly unlikely but I agree with you that the main prob with Lebanon political system is its deep-rooted Confessionalism resulting from Taif Accord and political factions capitalizing and exploiting this system and this includes Iran-backed Hezbolla or Saudi-backed Future Movement.