No they are not. Over 60% of Isrealis are Mizrahi, i.e Jews from the Middle East. The largest number are from Iraq, Iran and Morroco, with Russia coming fourth.
A large number also belong to the Yishuv, these are Palestinian Jews, who lived in the country before the creation of Isreal.
Don’t fall for Arab propanda, about Isreal being a European implant. What is undeniable is that every Isreali leader has been of European ancestry.
And how we conveniently forget the 5,000 Pakistani Jews that were expelled by Pakistan in 1956, after the Suez war.