The comment is contradictory: It says "If you go back 5000 years there's no evidence of Judaism...", then later the comment is: "most [the contradiction] Jews living there are immigrants from either Europe or the rest of the Middle East". AFAIK, there have been Jews living in Israel continuously since the beginning of Judaism, the number depending on how many fled persecution to the diaspora, (eg, at the beginning of the Christian era), and how many were killed in massacres. Doubtless many also converted to Islam, and according to a recent online article, seems most Palestinians - both Muslim and Christian, probably have DNA which shows their forbears were Jewish, and there are also the Druze and Samaritans - a branch of Judaism.
UN: Gaza could be 'uninhabitable' by 2020 if trends continue (AP)
from the article: Netanyahu, Obama talk Mideast peace, Iran nuclear standoff