For a start many are Christians. Second they all speak Arabic but they are a mix of the original inhabitants and Arabs. Many later converted to Islam and spoke Arabic. The Palestinians are a mix of the original inhabitants and surrounding regions just like any other place.

And BTW there is nothing special in people moving around, intermarrying, converting religions, etc... What makes this story special is that Khazars decided to steal it according to their cult text books and brainwashed gullible Americans into buying into the chosen people myth.

"Philistines"? The Bible is not history even if mainstream historians try to pull that one off the same way they try to convince people the holohoax was real. Canaanites were of the same Arab tribes that inhabited the region.