Madmarv, I hope you know Bethlehem was a city with a Christian majority while it was under the control of Israel. After the Palestinian Authority was created in 1993, it claimed that it will be home for all Arabs, both Muslims and Christians. Therefore Bethlehem was transferred under its control. Now the Christians are oppressed in Bethlehem and are a minority.
Therefore if you want that rights of Christians are respected in Holy Land, if you don't want to be persecuted like in Bethlehem or Gaza, it is your clear interest that Jerusalem and the State of Israel in general remained under Jewish control.