Not really, or at least it depends which country you are talking about: Syria or Lebanon. At the time of the French mandate (1920s) the Maronites were a minority of greater Syria, but were the majority population of Lebanon. The whole point of setting up Lebanon as a distinct country from Syria was to give the Maronite community a place where they could be the majority, free from the persecution of the 19th century and early 20th century. An Alawite coastal state was created at the same time (around Lattaquieh), and the rest of Syria broken up further. The problem was that the Maronites got a bit ambitious: in order to bolster the new country's economic potential, they persuaded the French occupants to add agricultural regions such as the Bekaa to the old (Mount Lebanon) territory, and the birth rate in those Muslim areas was much higher. With the benefit of hindsight, that might not have been the best move.
No census has been taken since 1932, for obvious reasons, but the estimate these days is 1/3 Christian and 2/3 Muslim. Not only have the Christians become a minority, but the Sunni Muslims have lost share and there are now as many if not more Shia Muslims.
The Gemayel family is a prominent one, but by no means the main or only one. Catastrophes were hitting Lebanon long before Bachir Gemayel could even walk. His father Pierre was a hardline nationalist, but can't be blamed for everything that went wrong in Lebanon before or after independence, either.
