Birzeit used to have a majority Christian population. No longer. While I do not have statistics for Birzeit itself, the Ramallah and Al Bireh governorate that it belongs is about 3% Christian. According to the Palestinian Central Bureau of Statistics, in 2017 the West Bank and Gaza were barely 1% Christian.
Yet major Palestinian political figures show up at the lighting of Christmas trees in Bethlehem, Ramallah and Birzeit claiming that Christianity is important to them. Not important enough to stem the huge exodus of Christians from Palestinian rule, but important enough to pretend that they are equal citizens.