What is the significance of monotheism as practiced by the ancient Hebrews?
God has a relationship with his people.
People are an accident of evolution.
People choose to worship one God out of many.
God leaves people alone to fend for themselves.
One of the significant things about monotheism as practiced by the ancient Hebrews was that "God has a relationship with his people," since the role of the religious leaders was relatively downplayed.