History is much more complicated. But you can read my previous post. The occupiers took slaves, not only Jews but also Christian. What do you think they lived on? Even in times of peace, they raided the reconquered lands, looting it, putting everything to waste and catching slaves.
Palestinians report IDF airstrikes on Islamic Jihad targets in southern Gaza Strip (Haaretz)
from the article: Prison dig reveals church that may be the oldest in the world