Lebanon is increasingly a Muslim country - many of the Christians have left.

In 1932 51% of the population was Christian, in 2017 only 40%: https://en.wikipedia.org/wiki/Demographics_of_Lebanon

Lebanon also has problems with cousin marriage - leading to lower IQ and birth defects in the next generation. 17% of Lebanese Christians and 30% of Lebanese Muslims marry their first cousins.

https://en.wikipedia.org/wiki/Cousin_marriage_in_the_Middle_...