The term Jew, or Jewish, can refer to either a nationality or a religion.
In biblical times these were one in the same. Nowadays a person can be one without the other. That is, they can be Jewish by birth but not belief, or they could be Jewish in faith but not biologically.
A person can be Jewish by birth, technically a child of a Jewish mother, or become Jewish, in a religious sense, through conversion.
From a human standpoint, Abraham is the founder of the Jewish nation..
Traditionally, the Jewish language is Hebrew, so Jews are sometimes called Hebrews.
A lifelong student of the Bible, Peter DeHaan, PhD, wrote the 700-page website ABibleADay.com to encourage people to explore the Bible. His main blog and numerous books urge Christians to push past the status quo and reconsider how they practice their faith in every area of their lives.