"40% or so, at least it used to be."
It used to be around 60% Christian when Lebanon became independent in 1948, and it was probably 75% Christian at the beginning of the 20th Century. Nevertheless, there has been so much emigration of Christian Lebanese to America and Europe during the past century (including my great-grandparents, who passed through Ellis Island in 1913), and especially during the past 50 years or so, that the Christian population is probably under 40% now.