Answer:
The answer is Jerusalem and Palestine remained under Christian control only sporadically and in certain cities during the Crusades.
Explanation:
During the Crusades, Jerusalem was conquered by the Christians in the First Crusade in 1099, but it was then conquered by the Ayubbids in 1187. It wasn't renegotiated back to Christian control until the Sixth Crusade, only to be lost again to the Khwarazmian dynasty in 1244. The population of Palestine was mostly Christian until 1187 when a Sunni Muslim of Kurdish origin named Saladin took Palestine (and Jerusalem) becoming the Sultan of Egypt and Syria and wrestling Palestine from the Crusaders at the Battle of Hattin.