I'm not sure where you heard that from exactly, but their unique confessionally-sharded politics mean claims like that often won't be deeply scrutinized within

I'm not sure where you heard that from exactly, but their unique confessionally-sharded politics mean claims like that often won't be deeply scrutinized within Lebanon. They won’t conduct a new census to check, multiple Muslim groups claim that they have the majority, and most observers who aren’t constrained by Lebanese politics think it’s closer to 30% Christian.