What is unique about Israel's religion?

Answer 1

Judaism is not essentially a religion.

Judaism is essentially a group survivial strategy.

As evidence, Judaism accepts and recognizes atheist and agnostics as jewish people, to be full members of the secular or reformed branch of Judaism.

Yahweh belief is an older strategy used by some orthodox jewish people to achieve group survival.

Modern christians have embraced Yaweh/Jehovah worship as a full blown religion.