[Yes the population of the Arab Christians in the middle east used to be 20%, now it’s 5%. ]
That is not true. Can you prove your claims with evidence?
[The population of the Palestinian Christians has dropped from 15% to 2% due to the Arab-Israeli conflict. ]
According to the British census of 1922, the percentage of Palestinian Christians was 9.8% and the British census of 1931, Palestinian Christians were 8.9%. You have to make sure that you have evidence when you cite figures like these.