jesus was a jew, and so were the ancestors of today's west bank palestinians, who live in historical judaea and are the descendants of the hebrews that once inhabited it.
the true palestinians, the philistines, were a greek tribe that lived on the coast (today's gaza) and that settled the region from crete around the year -1200. they were nether related to arabs nor jews. they were physically larger because they were aryans from greece, while the jews were itty bitty semites, stunted by poor nutrition resulting from centuries of middle eastern agriculture.
at this distant point in time, the ancestors of the arabs lived in yemen and somalia. they were south semitic speaking black africans.
what happened after the bar kokhba revolt is that the romans finished the carthaginian genocide by renaming judaea after the greek philistines, who had long lived nearby, thereby wiping the phoenecian jews off the map. the area was from that point known as philistinia, instead of judaea, although the switch was in truth not completely permanent, and roman administrators actually bounced back and forth for a long time afterwards.
when the arabs (from yemen) eventually invaded the region, they inherited the roman maps and the turks then inherited the maps from the arabs. they just took over the roman world and kept much of it in place, including the administrative divisions and also the christian religion, which was still dominant in the region until after the crusades when turks and turko-egyptians finally decided to wipe it out by force. the idea that christians slowly converted to islam for societal and financial gain, to improve their material conditions, is in fact a myth; the truth is that they paid their taxes, and successfully resisted conversion for centuries, both in eastern europe and also on the eastern mediterranean coast. the arabs were already long gone and a distant memory by the point that the turks started getting aggressive about it. the word palestine enters the english language from roman/greek philistine.
but the people that lived there were not greek philistines, they were converted hebrews, and descended from the ancient jews.
in fact, large swaths of what is today called palestine know that they're jews and didn't actually convert to islam until world war one. the multiple turkish genocides in the broader region to wipe out christian and jewish groups were apparently convincing enough to finally do the job, whereas centuries of taxation by islamic theocracies were not. and, whether you realize it or not, you are echoing and continuing this campaign of genocide and ethnic cleansing in the region put in motion by the ottomans every time you deny that jesus was jewish.