Lebanon used to be a majority Christian, but it’s not anymore.
Yes, the roots of the Lebanese Civil War went centuries deep and involved many factions of muslims and Christians. To sum it up into, “the Christians started bombing Lebanon” makes absolutely no sense.
Lebanon was split off by the British for the Christians.
East Jordan(east of the river) was for the Muslims.
West of the river to the sea for the Jews (Israel).
Gaza remained part of Egypt until 1967 when they invaded Israel and the Jews kicked their a$$.